One of the reason for high trust on bitcoin is that the bitcoin owner Satoshi identity is hidden. If all of sudden Satoshi come in the public and his identity is revealed, do you think it will have a bad impact on the bitcoin price and it can dump? Or do you think that bitcoin price will pump on this revelation? Mind you that i am talking about the real satoshi, not the fake ones claiming themselves to be satoshi.
If Satoshi would go public probably the price would go down since there would be a lot of speculation and many people could be afraid of Satoshi selling his bitcoins. We get daily FUD about pretty much everything, in that case it would be a mess, at least in the short term. Anyway I don't see a single reason why Satoshi should reveal himself now, disappearing was part of the plan.