We have no proof and evidence about the real status of Mr. Satoshi Nakamoto if he is already dead or alive until now. But I think why he do this to hide her self it's because he want to live in very private life realisation including with his family's and love ones. About the price decreasing of bitcoin, will we don't need to be panic. Because is just a normal situation when you are in this crypto world. Just relax because the price of bitcoin are still moving.