Kanter played a bunch of minutes at the 5 last season with Evans/Marvin. Gobert could take some of those minutes. If all 48 minutes at the 5 are going to Favors/Gobert, and Booker/Evans/Novak/Hayward are all options at the 4, as opposed to just Evans/Marvin last season, Kanter will have to play a lot better to increase his minutes.
Keep in mind, Kanter was 106th in the NBA in minutes last season (solid starter minutes), playing on a team with less depth. Gobert played only 434 minutes as well. There's no guarantee Kanter plays 2000+ minutes this season, especially if Quin is serious about playing a Spurs/Hawks style, with loads of ball and player movement, and emphasizing (team) defense. At this point, Kanter's a poor man's Al Jefferson, who's pretty much the antithesis of Quin's stated philosophy.
And that's why DL had publicly promised us that they will experiment with Kanter shooting 3's this year, starting from the corners and working his way to the longer parts of the perimeter. He has solid mechanics, and a nice touch. The way he has been playing defense, if he doesn't make that 3pt shot, I don't know if he's gonna be back next year.