the thing with sanchez is this, they messed up going into 2011, they let braylon go, they neglected the offensive line, and got rid of cotchery as well, and by 2012 he had a gutted offense. when sanchez had all that i mentioned, the team almost made it to the super bowl. hell he played decent in both afc title game L's as well, especially for a rookie and 2nd year qb, i wouldn't fault either of those losses on him.
offensively, unless the qb was rodgers, brees, brady, or peyton they wouldn't do much with that jets offense in 2012.
a first round draft pick qb especially a top 10 pick is a long term investment.
look at a guy like david carr, he might've panned out, showed some flashes with the texans, but his o line was trash, and he was sacked the most times ever in a season for a qb. you don't want to destroy your qb right off the bat. if the o line is trash and he gets hit alot, your risking more chances for a potential injury as well.
i'll say this, throw aaron rodgers into the wolves with the 05 49ers (a guy they could've drafted) on team that had no type of talent whatsoever, and you can make the argument that his long term development gets stunted.
it's no specific way to develop a qb, but the jets have been getting it wrong for years now. for sure guys like luck and peyton come around once every 10 years or so. other then that it's no guarantee the guy is going to pan out, but it's a good idea to try and help his chances of panning out.