But there's a "logistics" problem. Satoshi's identity is not known, even more, the world is full of Satoshi impersonators/wannabes. And I would not be surprised one of those will try to go to get the prize. And such development has the potential to end up badly for both the bitcoin community and the organizers too.
We always could put the physical reward to the museum rather than try finding who is Satoshi. As for money reward, IMO it could re-distributed to nobel prize winner on different category. But AFAIK it's very rare to see dead or anonymous nominated for nobel prize.