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.
Is the price the only aspect of bitcoin you care about?
Bitcoin decentralization would receive a great blow if somehow Satoshi come back from nowhere. He would become something like Bitcoin CEO or ambassor, and decisions would somehow become centralized on him.
Price is always hard to predict. In short term it even might go up. But in long term, bitcoin certainly wouldn't be what it is today.
Fortunately, this is only a speculation and Satoshi will most likely never Reaveal himself