It doesn't change anything. Do you see any strong impact happen to Ethereum when people know who is the creator of that coin? Nothing right so maybe the same thing will happen to Bitcoin and people will just continue to do their thing especially on investment.
It doea actually. If his indeed alive and can access his wallet dont you think its not gonna make a bubble? Of course people will get panic that a possibility Satoshi can dumped his bitcoin share could be a tragic blow to market and possibly whole financial sector. But lets hope that if his indeed able to touch his wallet he wont do anything that ruins its current state.