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

[Mudhammam]

why do you suppose infinite regress means "our" universe, whatever that means, fluctuates?

Because, if universes begin with a big bang from a singularity, as is commonly (but not universally) accepted, then the current universe must necessarily collapse in order for the next one to begin.

Philosophically, there's nothing prohibiting eternal universes. But, our observations so far indicate otherwise.

I suppose there's always the possibility that other universes are created in black holes, our own itself contained in a region that to outside observers appears in one small corner of their universe. Of course, this doesn't approach a solution to the Alpha.