I always had a major issue with the multi-verse theory. It always felt like the "infinite number of universes" was kinda misguided and filled with human interpretations of what "infinity" actually means.
I've never come to terms with the possibility that there may be a universe out there that's exactly the same as ours, but only my neighbor is missing (or something similarly ludicrous) and I'm glad to see this new theory seems to move away from that nonsense.
Having more than one universe however, makes perfect sense to me. We're always blabbing about how unfathomably huge our universe is, but huge is such a subjective word, as our universe is only big from our perspective. In the grand scheme of existence, our universe may in fact be very, very small and in that context it's no great leap to imagine that if one universe could spawn, why not more?