Vikings have to push hard for a Super Bowl run this year or next. AP will probably be done within 2-3 more years(done as in being a top-tier RB, he may hang around a little longer than that, but won't be elite anymore)
AP is a freak of a human being, but he's been worked like a horse, he's probably not going to play for 12-13+ years like Emmitt Smith or Walter Payton
A lot of the guys that hit 2000 yards were pretty much done within a few years after that, Barry Sanders retired 1 year later, Terrell Davis never had another decent year, OJ Simpson had like 2 or 3 more good years and that was it, Chris Johnson hasn't been nearly the same back since his 2000 yard season, I wouldn't be surprised if he's(CJ) out of the league in a couple more years.