I think the big bang theory might be superseded by M theory... I don't like big bang theory because, at the moment, it provides no explanation for why the universe began - the very claim for which it is so popularly famous. It completely misses the point. While it is a good explanation up to the Planck era
, but it gives us nothing beforehand, and I don't think it ever will.
I personally don't think we ever will actually find out the origin of the universe. Of course in my lifetime (hopefully) we'll find out to a better degree what happened even earlier than

, but, t = 0? When you try to ask these questions you require new logic, new maths (than what I and probably the majority of the users on this forum have), etc to conceptually understand what actually is happening in space (or in this case happened). One of my goals in life isn't really to come up with a new theory, but, to actually understand the theories the greatest minds have come up with.
Lol having debates about string theory and even general relativity that's a forum for PhD students to discuss, YOU WILL NOT learn about this stuff on a detailed level as an undergraduate.