IF he has no future as a QB at the next level and IF he has no plans to change positions to possibly have a future in the NFL, then he probably has to cash in now and his main priority may be making as much money as he can before his football career is over.
And on another note, if he were willing to consider a position change for an NFL future, what would that be? He's too short to be a tight end. RB, WR, DB? Is FB even a thing anymore? I know that Michael Robinson made the switch from college QB to NFL FB, but I'm not sure how many teams even use an actual FB anymore, seems like that role is filled by a TE these days.