Irrational Physics: The births of multiple universes

Assume for the sake of argument that any given region in space will grow to the point that there is an external event horizon beyond which objects fall out of reach (see Steven Weinberg’s “The Future of Science, and the Universe”). Were this the case, would you see a collapse of the contents of a given set of objects within the event horizon after everything fast enough or distant enough to escape had escaped. Would this collapse look like one supermassive black hole and would that black hole, absent any possible outside influence, eventually explode into its own new universe?