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 he shows up there might be some disturbance, people trust bitcoin because of its decentralization and Satoshi can't control the whole bitcoin so I don't think it can adversely affect it. Bitcoin exists and thrives to this day thanks to the worldwide community of bitcoiners.
We are grateful that Satoshi made bitcoin for us but at this point, bitcoin is no longer private to anyone including Satoshi.