I disagree. As has been stated several times, if Tebow can consistently throw 50% and limit his turnovers, his other abilities will make him a solid NFL QB. "Average" NFL QBs have better passing accuracy than Tebow, but not his ability to run and create problems for the defense.
But again, Tebow's accuracy in college was good - so to think he won't improve after his first full NFL season is ridiculous. Will it get up to 60-65%? Maybe not, but no reason he can't be consistently at 50-55%.
To me, it falls on Fox. And people may think that's a copout, but look what happened last week when Tebow aired it out. Not a pretty %, but big results. Yesterday, they took very few shots - even when down by 14, 21, 28, it was run, run, run or run, run, pass. Tebow's not a great passer - but it also didn't help that many of the times he threw this season, the defense could pressure him and key in on the pass.