He has gone significantly under 3 of the last 5 years
Both years he went over he was healthy the whole year and played in all 16 games
I think it is a lot harder than you guys think....yeah he is probably the best pure runner I've ever seen but he is playing on a subpar offense (lost Harvin) and takes a ton of pounding.
He easily could do it, he isn't any kind of big dog not to but on a subpar offense I wouldn't bet on anyone to get 1700 yards rushing