Hawking radiation, the unproven theory he came up with, where black holes evaporate over time, is unproven, and I don't believe it's possible. The black holes are required to suck up all energy, including dark energy, fall back together due to gravity, causing the big bang, in order for the big bang to have ever happened in the first place. The original causality for one big bang was God. Many cosmologists believe in intelligent design, which basically means they think God did it. A singularity of infinite density in which time doesn't exist has no causality, and no possibility of doing anything, so it has to be an endless cycle of events, endless causality, what goes up, must come down, every action has an equal and opposite reaction, energy cannot be created or destroyed, it only changes form. None of those basic laws have been proven wrong, and also probably can't be proven wrong.