One TD pass does not make a career. Tebow’s problem was that pass was the only good one he threw. How many good passes do you think Tom Brady or Aaron Rodgers have thrown, more than they could count, not just one. I was a pitcher in college baseball. If you put me in a MLB game, I could get a few major league hitters out, but not enough for any team to keep me around after that outing. That is Tebow’s story also.
If every team could have a Rogers or Brady, the league would be a lot different. There are a lot of mediocre starters and a lot of terrible backups. Why aren't you comparing him to Blane Gabbert, Christian Ponder, Jason Campbell, Ryan Lindley, or someone like that?
(Blake Bortles had an 11 to 17 ratio, compared with Tebow's 17 to 9 ratio. I bet Bortles is still a starter)