I never really thought that Satoshi has actually mined all the coins the general public assumes that he has. I am quite certain that there have been a couple of more individuals all more or less mining at the same time. I find it more interesting to know what actually happened with all the 50 BTC rewards that have never moved. Did they burn them? Are there still private keys of all the addresses stored somewhere? We will likely never find out, and it is better for this entire ecosystem that we will never find out. At current levels it will be pretty destructive for the market (not for Bitcoin directly) if the ancient coins start moving. I hope they are burned, even the genesis block reward.