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.
A philosophical attempt to work out a universal history according to a natural plan directed to achieving the civic union of the human race must be regarded as possible and, indeed, as contributing to this end of Nature.
And I entered and beheld with the eye of my soul... the Light Unchangeable... He that knows the Truth, knows what that Light is; and he that knows It, knows Eternity.