Because he was essentially able to call his own tune at A&M — remember that ridiculous suspension of a half against Rice? — he has never had to grasp that doing whatever he wants whenever he chooses can have consequences. He’s Johnny Football! ESPN loves his act! The Worldwide Leader can’t get enough of him!
Here’s the thing, though: What ESPN creates, it can also destroy. Teams eventually tire of seeing themselves depicted as the supporting cast for Tebow or T.O. or Ochocinco. (The exception is LeBron, who’s good enough to make any team delight in being his supporting cast.) It will take a while — the Browns won’t give up on Manziel just because he flipped off the Redskins — but eventually his NFL team will decide that Johnny Football is more trouble than he’s worth.
That’s provided he keeps trying to be Johnny Football and not simply Johnny Manziel. If he can control his excesses and play to his strengths, he can be a good NFL quarterback. If he can’t, he’ll soon be sitting next to Tebow — whose failing wasn’t excess but the lack of an NFL skill set — in a studio in Charlotte.