I dunno if he will be fine, it's pretty hard to tell at the moment, some guys have the intangibles, work ethic, skills + the proper coaching and environment to succeed.
However some guys just never get it, look at Alex Smith, #1 overall pick, entering his 6th season now, surrounded by plenty of weapons and I swear you could grab a FA off the street who would perform at least the same as this guy.
The thing with Sanchez is I just dunno about is attitude, in Hard Knocks he came across a bit pompous and precious, seems like maybe the pinnacle of his career was simply getting drafted by a team in the limelight, I'm not sure how hard he's willing to work for it.
Having said all that, not really sure that the Jets team is the best place for an offensive playmaker to show their stuff, I don't think Rex knows much about offense TBH