Tebow is already on record that he "will relentlessly pursue his lifelong dream of being an NFL QB". Sadly, some guys just won't accept their talents don't necessarily match their dreams. K Stewart is a prime example of a guy that could have been a perennial pro bowler if only he could have gotten past himself. Don't have a problem with a guy believing in himself, but if absolutely no one (even the guys who are paid to know) sees it like you , sometimes you need to hear what others are saying.
Can you imagine how Steeler history would be different if Hines Ward had insisted that he was a QB and refused to play anything else?