I don't believe that Satoshi's identity will ever be known, but i disagree with you that if Satoshi is revealed BTC will go to zero, yeah there would be a lot of panic, people would think that since he mined so many coins in the early days, he is about to dump it, this panic will make BTC price to plunge severely, but never to zero. Just like every other fud, it will settle down after sometime and the price will gradually pump again.