Um, the dude is 6'3", 260 lbs. He's FU'd the Big Show. You make it sound like he's built like Brian Kendrick.
Are buyrates, house show attendance, ratings down appreciably with Cena as champ? No. He's pushing merchandise, he's garnering the biggest reactions of anyone on the roster, so what if he's getting boo's as a face? It's not really affecting business. Until it starts making a noticeable dent in business, I see no need to job the guy out & bury him in the midcard and/or take the belt off him. Vince et al need to figure out a way to use this to their advantage without messing up the dynamic at work.