People are crazy if they think that Bitcoin is going to die if Satoshi's identity is revealed. First of all, I'm sure this isn't going to happen, satoshi was a smart guy and he knew what he was doing, so he left no clue whatsoever for people to find out his real identity. But, just for the sake of the argument, if his identity is revealed somehow, it will surely create panic in the market, the market might even crash, but it will all be temporary because as you said, Bitcoin is not being used by a small quantity of people anymore, there are millions of people involved, industries are having their fingers in Bitcoin.
A short-term panic and crash isn't going to change much. Things will cool down, and people will still be interested in Bitcoin and its existence, I even think that Satoshi's identity reveals might increase its popularity in the world and that could be a positive thing for Bitcoin itself.
Of course not. Bitcoin will still be around with us because of the way it was designed. The reveal of Satoshi's identity might have a negative effect over BTC's price. Especially if Satoshi decides to sell all of his Bitcoin holdings. If he doesn't, prices will only go higher in the long run. Assuming the discovery doesn't turn out to be a government agency (NSA/CIA) or something.
I wouldn't want to know the identity of Bitcoin's creator. Aren't there more important things to focus on? Keeping Satoshi a mystery would be for the best. It's what makes BTC different from other cryptocurrencies (especially ETH). Hopefully, there are better days ahead for Bitcoin. As long as it stays decentralized, nothing else matters.