He's definitely going to get lots of offers higher than the minimum.
Furthermore, I think his best role is as a roamer PF playing next to a stronger C who can space the floor. In other words, Al Horford. The way our team is built now, he can't play next to Queta due to spacing issues and playing with Garza or Tatum would be a very small frontcourt (remember, Rob is only 6'9'').
Of course, we can't necessarily solve all the roster issues in one offseason, so I'm not saying they shouldn't kick the tires with his agent. It's just if you're paying him 10-14m, could those resources be better allocated elsewhere? What about Queta when he needs to be re-signed? He should be making the backup big dollars, not Rob.
But, those are just the hard decisions you need to make under the new CBA when you've got older stars already making 35% of the cap.