Tebow does not have to learn to hit against major league pitching if he is signed as a relief pitcher. A successful left handed relief pitcher is extremely valuable and his career could last into his early 40s.
The Dodgers are in need of pitching so this could be a good gamble.
No - word is that Tebow is looking for a corner outfield slot, not a pitching role. He will have holes in his swing, and not a lot of time to close them, given his age.