Is there really any problem with an infinate regresion of universes?

[John V]

Yes, it is.   Neither theory nor observation insist the supposedly parallel propositions as you put it must be really independent of each other.   All that is required by the fact that our universe appears to be headed towards an end state very different from its initial state is each successive proposition is not required to actually be made from the end state of another.

And so it's not an infinite regression. You're just trying to have your cake and eat it too, i.e. propose some sort of multiverse and try to dress it up as an infinite regression.