The best "mobile" quarterbacks are still those who are pocket passers first and are simply able to get away from pressure when the pocket collapses. That often just means "good quarterbacks who happen to be young." Look at Aaron Rodgers now, or Donovan McNabb back when he was good.
It's a passing league. The Patriots have shown that a brick wall O-line and a QB who can stand up in the pocket and make accurate passes is the way to win consistently.
I don't think anyone is debating that.
My problem is you have guys that simply grab onto the concept that a guy sucks as a passer, and never give them a chance. For some, athletic/running ability can bridge that gap in their career, and help them succeed despite that lack of accuracy. In time, the accuracy may develop (as it does with some QBs). If it does, you have a guy who can escape pressure from time to time.
Instead, people simply say... oh, this guy can run and therefor will be a terrible QB. I am glad to see they'll give Tebow a shot.
Hell, in the 3 games he had last year, he ran the ball an average of 10 times per game and threw the ball an average of 27 times per game. He averaged 6.4 yards per carry, and 8 yards per pass attempt.
Those aren't gaudy numbers, but if he can up his completion percentage and run the ball the few times he has to, he can put his team in a position to move the chains, maintain possession of the ball, etc... which generally leads to Ws. He's showing a bit of that now as a sophomore QB who has been given limited chances. If he develops, the Broncos may have something.