Well if even one of us can get each other from one dimension to another, that should be enough to get anyone to a better dimension.

But I guess you're right. If other people want to stay here, that's not my problem. [Though for Bowser it's less a matter of individual choice as it is simply being apathetic about the danger to his fellow void residents.] But it comes down us all going home or us all staying, I'll do whatever it takes to get out of this place to my world.