Devine might just quit football altogether. He mentioned that before this season started he really didn't enjoy football. It was a means to an end. He's got wonderful physical gifts, but you can't just put the desire to play into somebody. If anything, I'd think he'd leave the team and finish his degree since he's a RS Jr and likely going to graduate next semester. But I would hope he sticks with it through his last season, despite being beat out by Braun and Bryan.
As for Antonio, he took a semester off for reasons only the coaches and those close to him know. Also, Dedrick's suspensions could have been grade related. We'll see how that develops. If they all three leave, I'm seeing an offseason very similar to before the 2014 season.