People have been talking about multiverses as a philosophical idea for a long time. But the current incarnations in physics, I think, are more indicative of problems with some things going on at the frontier of physics than ideas that are gonna last.
Actual philosophers... are commanders and law-givers: they say "thus it shall be!", it is they who determine the Wherefore and Whither of mankind, and they possess for this task the preliminary work of all the philosophical laborers, of all those who have subdued the past - they reach for the future with creative hand, and everything that is or has been becomes for them a means, an instrument, a hammer.
We come to recognize that playfulness, as a philosophical stance, can be very serious indeed; and moreover, that it possesses an unfailing capacity to arouse ridicule and hostility in those among us who crave certainty, reverence, and restraint.