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It's not a new idea, although I don't think it would be accurate to describe the other universes as "contained" within the black hole.

Black hole to White hole to Black hole

It’s holes all the way down

That's a wholly a whole lot of holes.

Does it also follow that black holes in our universe contain universes internally, beyond their event horizons?!

Not necessarily. It's not clear that any are massive enough to cross the threshold required for the "bounce."

Damn, I would not have guessed that Men In Black was actually a documentary...

I thought the universe they were saving in that was in some kind of "fish bowl" type universe (galaxy?)