if you haven't had a chance to watch The Brady 6 documentary on ESPN, i suggest you do.
i think Tebow has the physical ability and the mental dedication to become a VERY good QB in the NFL. much of this will be dependent on the OCs that he plays for and the veteran QBs that are brought in to mentor him. he may not ever be able to chuck it like Farve, but in the right offensive scheme, his arm will be a non-factor.
i say this as a Charger fan. i don't say much good about Broncos, at any time, but think this kid has the intangibles to be quite successful.