You say dozens of goblins like that will be a fun fight for the players and not just a numbers slog.

Fighting a bunch of goblins is pretty much all low level PCs do anyway. I don't see that as much of a bad thing honestly. Hell Lost Mines is all about fighting goblins for the first few levels.

Could this spell be.... moved? Like, if something excavated the floor/ground under the dome and started carrying it away... would that work?

Quote from TheMercurialist >>

Could this spell be.... moved? Like, if something excavated the floor/ground under the dome and started carrying it away... would that work?

 I would look at the word "immobile" in the spell description.

Some relevant info here about what can pass through. According to J.Craw, something non-magical and non-objectical like a dragon’s breath CAN pass through

https://www.sageadvice.eu/2018/01/29/does-the-breath-weapon-go-through-leomunds-tiny-hut/amp/

It would seem that other non-objects such as a river of water or deafening noise would also work, as long as they aren’t magically produced. Flaming oil perhaps? A blistering gale of wind so forceful that it pushes the occupants within the dome 15ft on a failed save, perhaps?

no, but an intrepid and large enough group of enemies might excavate below it so that when the spell dissipates the party hiding within just plops right into a pit fall.

Honestly there's a lot of absurd over interpretation of this spell. It's clearly intended to provide a place for the party to take their long rest during travel and act as a trainer for Magnificent Mansion.  In the earliest levels having a watch and random encounters during the night is a great way to get the party thinking as their character in their decisions, this spell then comes in and gives the party (and dm) a respite from that.  Then shake things up with enemies that know dispel and disintegrate and ruin that cozy rest they were taking. as far the question of "air cycling", it says nothing about being air tight, it's comfortable meaning protected from uncomfortable elements of the weather or environment like a storm or in a swamp but it would still allow airflow.

If you cast 'enlarge' on someone inside the dome, the dome ends. If your party has a large animal, like a horse or a brown bear, that animal cannot be kept under the dome. If it is included in the dome, the spell fails. Frankly, I don't like that element of the spell, though all the other things that people whine about are not an actual issue. Mostly DMs who can't stand it when players actually have fun.  This is in no way whatsoever OP. It takes a long time to cast and if you're that dead set on attacking PCs in their sleep, then the problem is behind the screen, not with the spell and not with the players. 

ETA: Yes a minute is a long time. It takes it out of combat utility without significant planning and preparation. Most pcs are never going to prep this spell to begin with and will opt for the 10 minute ritual cast anyway. If they want to burn a spell slot for this instead of Fireball or Counterspell to gain a little tactical advantage in a fight they can prep for, then that is just fine by me. 

Stop giving the spells different names, or make it possible to turn off. Please. I don’t want this nonexistent spell to keep popping up whenever I try to look at a list of spells.

Should be Abjuration! Makes way more sense.

This is a generic version of Leomund's tiny hut from the Players Handbook. Many other spells with people's names in them have generic versions for the Basic Rules.

Dispel magic. Beyond that I dont think there’s anything else. 

Then there’s my DM who refuses to allow it to be used in the first place. 

Jeremy Crawford has said that it does have a floor on Twitter. https://twitter.com/jeremyecrawford/status/823774362293542912

A hemisphere has a bottom. It's specifically why they chose that wording because it has a bottom.

Why is this Evocation and not Abjuration?

No, but as mentioned dispel magic can work. That said, they have to come out of the hut sooner or later and while the adventurers are in there resting the enemy could be placing traps/guards to get them after they leave the dome or it expires. I personally would not bother to dispel since it is so much better to have a ton of traps/mobs set up while they are sleeping. Depending on how you take it you can even have the dome be part of the trap. According to the way it reads the dome can be walked on by enemy mobs and can have objects rest on it. So, after you set a ton of traps for anyone who leaves you can start stacking rocks or something on top of the dome itself. That way if the adventures stay in the dome till it expires they get crushed and if they try to leave they have to deal with traps/guards.

@NixHazzard #18 point No. 7 "rocks fall, everybody dies" lol

Does the telekinesis spell could move the dome as an object—with some living freight inside? Yesterday I found this little ring and there is an active vulcano less than 8 hours to march away. I could use the dome upside down as a floating platform and eventually drop it into the boiling lava…

Or should I give it to my druid friend from the circle of the stars, to let him watch them from a near? He has a wild shape of ant falling (mouse or cat would work too, as well as anything with a fly speed at higher levels), so it doesn't matter if the dome expires at any dangerous height.

P.S.: requires "immobile" means "not automobile", but not "immovable" like the infamous rod

My confusion with this spell is that it says that 9 creatures can fit in the dome with you (9+you=10 total occupants), but then immediately after it says that if its area includes more than 9 creatures (and 10>9), the spell fails. So, as written, it seems to me that they’re saying “Well, hypothetically there’s enough room in the dome for 10 people, they could physically fit, but that hypothetical doesn’t matter because the spell would fail the instant you cast it. You have to leave that 10th space open for social distancing reasons.”

Shouldn’t the wording just say either, “Eight creatures of Medium size or smaller can fit inside the dome with you,” or, “The spell fails if its area includes a larger creature or more than ten creatures,” to make the two adjacent sentences consistent with each other?

Everyone arguing about this being unbreakable, just remember if you are using this to hide from a large group of enemies, or what I was thinking of, a dragon, two things could happen. 
1. The enemies wait till it ends
2. creatures dig underneath the spell, and transport the dome around similar to uprooting a plant and transporting it.

It's immobile, though.