The average HOF Monitor score for a HOF RB is 107.
Henry (29) - 33.45 (95th)
McCaffrey (27) - 31.85 (107th)
Chubb (28) - 25.93 (158th)
I'm just thinking out loud here, but I don't think their careers are over yet - and they all do have a chance (Chubb least likely as even those numbers show). I'd bet Henry ends up in the HoF.
I agree that Henry is a HOFer.
I'm not suggesting Henry will or won't be a HOFer, but I would suggest we won't know for quite a while. In today's game, not a lot of RBs make it past 28 let alone 30 years old. If he keeps playing and playing well for a few more years, then his chances will increase accordingly. If he got hurt and missed half the season again and averaged 3.5 ypc, he might not be on a HOF track and could see his workload reduced. To date, every back that had 12K rushing yards has or will be inducted. Henry's at 8,335. That's another 3,665 yards. There are several players at 11K+ that aren't in and may not get in (Taylor, Jackson, Dillon, McCoy . . . with Dunn a few yards short of that).
The post above projects Henry to finish in the Top 20 in career rushing yards. Taylor, Jackson, and Dillon are in that group, and I don't see any of them making it in. Henry is a lock to end up in the Top 20 in rushing TD. He only needs three more to get there. There are several guys on that list as well that aren't in yet (and are iffy to get in): Alexander, Holmes, Lynch, Dillon, Anderson).
Henry had one big post-season, but the Titans haven't won anything and haven't make any other deep playoff runs. I don't think he will get bonus points for leading a SB winning team like some other players might.