Adoption: people who don't trust the system for privacy reasons
Even though Nano is not a privacy coin, the powers that be have historically been dumb, slow, and focused on big fish. For this reason, if there were some kind of 'fedcoin' system that plugs into all our transactions, Nano would still be appreciated by those who want to stay relatively out of the spotlight. The biggest users would be people who read stuff like this and have friends/family with the same outlook:
It could be nice if there were champions of Nano in libertarian circles bringing it up in discussions. After all, did btc not start that way?