Satoshi Nakamoto´s identity does not matter in the scheme of things of Bitcoin itself, but the person himself does matter in Bitcoin. Considering Satoshi is estimated to own between 1 to 1.5 million Bitcoins. This give him enormous power. All he would have to is dump all those Bitcoins onto the market and the price would crash. If he continues to hold onto them and Bitcoin becomes more established and accepted and thus its value escalating, then he will most certainly be the worlds richest man. He matters alright.