Acquiring Miller is kind of the very reason why you shouldn't expend big-time draft capital on a running back, unless (and maybe not even then) the RB you're drafting is a guy like Saquon Barkley or Adrian Peterson. You can always find a guy who can do the job. You can't always find a Christian McCaffrey, but you can always find useful players at the position.
Last 5 seasons' average year:
225 att, 981 yds, 4.4 ypc, 6 td, 35 rec, 270 yds
I mean, that's perfectly fine. You don't want this guy handling the ball 350 times probably, but give him 200-225 total touches, and he's going to produce for you.