I think the key is going be designing a decentralized system that can verify uniqueness. If you could easily do this you could even design a proof of stake type coin that doubled the block reward if you gave it out to some other unique person’s address. I’ve thought about ideas like this for a ‘pay it forward’ type coin for rewarding people that make efforts to build value in a coin. I don’t see how to easily guaranty that a coin address is held by a unique individual though.

Nice post.