Nah, I totally disagree. I think people would prefer to give it to Mitchell and he only won't get it if Simmons handily beats him in stats. Mitchell is more exciting and has MUCH more scoring ability. Simmons has him beat all around, and defensively (for now). But Mitchell wins all of the intangible battles.
He's exciting as hell, no weaknesses, and is the type of player that people all around the league fall in love with, not just people in Utah. He just has the look about him. If Mitchell earns ROTY he will get it, I'm very confident.