Just because all of our Big Bang Theory models are wrong doesn't mean that Big Bang Theory is wrong. It just means that we don't have the correct model yet. The biggest problem it faces right now, I think, is that it has to obey the law of conservation of energy and it has to come from an open singularity because of this. This is why everyone has leaned toward the idea that it came from particle, anti-particle pair creation and annihilation. Think about it, it is the only principle in physics that allows for free energy! It has been dubbed the conservation loop hole. So then if white holes cannont exist, and it didn't come from a quantum fluctuation of particle, anti-particle pairs then it would have had to have come from some other sort of free energy interaction. In other words, Big Bang Theory is going nowhere fast. It just basically sums up what we already knew from the start. Everything came from a big explosion. We have only touched on being able to describe that explosion more accurately, without any more of a clue to what happened to cause that.