No, it isn't, but I could make a lot more sure-fire positive predictions for the 49ers. It takes more balls to say that than it does to say Patrick Willis will lead the league in tackles. We're all homers to one extent or another. I believe Alex Smith has the talent to be a top 5 QB in the NFL, and I believe he's been grossly mishandled in his first four seasons, not to mention outright mistreated. He has everything you want in a QB... mobility, intelligence, leadership, accuracy, underrated arm strength, and he's 6'4". From the measurable, he's got everything you want.. but he's played under 4 different offensive coordinators, a head coach that didn't like him and made a point of calling him out every chance he could (how do you become the leader of a team when the head coach undermines you at every opportunity?), and he's played in 3 different systems.
You cannot develop a quarterback that way. This year, they're keeping the verbiage from last year (meaning no more memorization), and simply changing the scheme. All he's gotta do is execute. All reports out of OTAs were positive, that he was impressing people. He sat out last year, finally healed.
Maybe he'll be terrible, or maybe he'll finally continue the development he showed under Norv Turner. Maybe Frank Gore will finally be the center of the offense so he can develop. Maybe the 49ers finally have a deep and talented enough receiving corp that they wouldn't make Joe Montana look terrible. A lot of maybes, but I think it comes together for him this year.
If not, Shaun Hill is above average. He can get the 49ers to the playoffs in that division. So that prediction stands either way.