It could fall 99% over a week. Going to zero overnight is bit of a stretch. There are way too many zealots in BTC community. Personally I think it is more likely to fall like Ancient Rome, British Empire or modern Sweden. BTC is more likely to end with a whimper but either way trash is trash, end is end. Some idiots loading up BTC because it's the talk of the media is going to keep prices high.
One think BTC wouldn't reach is a $100 billion market cap.