Nor should he. Kanter hasn't earned or proven **** yet. You don't go into the season with 3 bigs and change. If Kanter proves he can score, defend, and play 20 minutes a game without getting winded after 15 games then you move a big for a 4th man. Right now, Kanter has nothing but potential. If he can't hack it, we'll need Al and Millsap. Kanter is worthless if he can't keep up, he barely made it through a shortened season, and was eating turds for a good chunk of it. I need to see a lot more from him before I'm convinced.
As the roster is presently constituted, I don't even know how he would get 20 minutes 15 games in a row. If he's lucky, he may get 15+ minutes in 3-4 consecutive nights, unless there's an injury.