Demiplane and dispel magic

[CrazyCarppy]

Specifically I am wondering what the interaction between the entrance to a magnificent mansion and a high level dispel magic would be.
Nothing happens?
The mansion spell is ended?
Everyone dumps into the prime at the point of the entrance?
What do you think?

[Damon_Tor]

I don't see why the spell wouldn't be ended, with the occupants ejected into the prime material plane where the entrance had been located.