It is quite possible to prove, but it is unlikely that anyone will be able to do it.

It is interesting to know how exactly it will be possible to prove the Satoshi is really that Satoshi we talk about... Or may be he left somewhere someday the fingeprint of the retina-scan data and we would be able to compare?... I am joking))))) I think that even in case it may be someday it would be really hard to prove.... And in my opinion more exactly that such thing will never happen. This person will forever stay as an inventor of something new for our generation, something that noone did before him))))))