The only people saying yes to this poll are people who only play natives or really like 'em.
Don't get me wrong, they're really fun to play, but with the current rulesets they're annoying enough as they are. They can already assist other factions in attacks and commit their own raids. Historically speaking, rarely did they ever capture a European fort.
In addition, they'll gain access to European weapons (muskets, swords, pikes) and European uniforms which would simply be stupid. They already have their own (free) weapons, they don't need more.