What's the shelf life of a running back now? 3-4 years on average? Some last a little longer, others less. You might as well say Lamar is a running back since he carries the ball as much or more than our running backs do individually. Odds are better than average that his elite, running ability will be declining in the next 2-3 years and he'll transition to a more traditional, pocket quarterback who occasionally will take off to pick up a first down. But the days of 1,000 yards on the ground will be long gone I think most of us here have always expected that to happen sooner or later. What that means for Lamar is he either evolves into a top 5 passer to diversify his impact or he just becomes a very mediocre quarterback. I'm not going to project that far into the future but its safe to say his best years as a runner are decidedly closer to ending than what me may want to accept.
I think his best days as a runner may already behind him but his second and third best days as a runner are still gonna be better than basically anyone else in the history of the sport at the position. Its not like he's gonna go from what he's been so far and suddenly turn into a guy who never escapes the pocket.
I think over the course of a 5-year deal we'll see the read-option or called QB run plays diminish to only a handful or so a game, but he's always going to be a problem in the pocket in terms of escaping pressure and trying to hit a receiver downfield in broken coverage or to take off for a scramble. I'd agree he's probably not breaking 1000 yards every year any more, but he's still gonna be getting several hundred yards of rushing throughout the year and will still have the ability to take over key moments of a game with his legs if absolutely necessary.
And he's still only 26 years old. I do think he's got multiple seasons left of being a athletic freak that can do amazing things on the field. That his future freakdom might be slightly diminished from his early 20s doesn't make what he can still do any less useful to an offense.