ok, no. A senior who has one foot out the door should not be kicked out of class. Why? Because the decisions of that senior to slack off has no bearing whatsoever on anyone else other than his or herself. If you don't show up to class, the other 29 or so people's lives go on.
The negative decisions of your QB can have negative effect on 10 other guys.
Ok, and what if that student's salary was contingent on how he did in classes that senior year? You think he's going to slack off? If every college player who had his eyes on the pros was determined not to be "in it" anymore, we'd miss watching all of the best players in college.