If Satoshi wanted for some reason to prove his identity to us in this forum, he could just log back in to his bitcointalk account
But really it doesn't matter. Bitcoin is strong enough to survive and prosper without it being driven by a personality.
We can be grateful to Satoshi for what he started and respect personal privacy at the same time.
Some people like to be in the spotlight, some people don't. IMHO the most interesting people are the introverts who don't live their lives through a loudspeaker.