I don't care how many yards from scrimmage Fournette had; he's been nicked up his whole career, he's a malcontent, and - to put the cherry on top of the metaphorical shit sundae - he's an expensive rental. However much you may want to get him, you're going to lose a lot more good players if you do that, like, say, Ramsey and Kupp if you re-sign him, or you wasted a valuable Day 2 pick for one year of Fournette's production, if you don't.
Compare that to an excellent running back class overall (with names like Taylor, Edwards-Helaire, Dobbins, Moss, Benjamin, and many others even when not including Swift) who will be signed for four years, and you can see why I don't value Fournette as much as you do.