You don't replace a guy who does nothing but make you win. I'm not saying it'll last forever, I'm just saying he has a better record than Drew Brees the last 5 weeks
One thing Fox has to like about Tebow is not only does the offense play hard for him, but also the defense. I bet they respect someone who plays hard and hits like a LB. I don't believe I have ever seen so many players demonstrate their loyalty and affection for a QB. When Tebow makes a TD, every player near him mobs him.
He will get better, I promise. Good enough to win a playoff game? Not by himself. However, his greatest strength is he asks for and gets a lot of help from his team.