It's not an unreasonable question. Until he put up a wRC+ close to 200 this year, Trout wasn't really a better hitter than Miggy or prime Pujols, and people fairly draw comps between Vlad those two guys. The realistic upside right now is very much "best hitter in baseball".
I really hope he's not just here for 6 years. Toronto is a world lass city, and there's no reason why we can't enjoy this possible HoF career from beginning to end.