There are lots of ways to reveal an identity but the most credible is by signing
a message from any of the recognised wallets, simples! . . . and Satoshi
knows this so if its going to ever happen, thats the route that will be taken.
and just to add, Bitcoin is now much bigger than any one person, even if that
one person is its creator. If anything happens to those Satoshi wallets there
will be mass panic by those who believe Bitcoin is dead while the "Bitcoin
Community Leaders" will take advantage of the short term market panic as will
the masses of true Bitcoiners.
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.