Alex Smith is a system QB, tbh..he was completely irrelevant prior to Harbaugh's arrival IIRC..

He can't make big plays, he can't play under pressure(the Saints historically bad defense doesn't count), he doesn't possess any special qualities that would make him an upgrade over most starting QBs, tbh..

He could help teams like the Jets and Jags, but only because their current QBs are atrocious..
i dunno, I like Alex Smith on the Jets. It was only a couple of years ago they almost went to the 'bowl with a borderline re under centre...