I think that if anyone is serious about putting Murray on a 'pitch count', the next thought needs to be finding a way to have Ryan Williams active on game days to help carry the load.
With Randle having a concussion, he might not be available and I haven't seen anything to suggest Dunbar is a viable option and nothing more than a niche player.
You want to go committee? You'd better figure out a way to have Williams active, and you'd also better be worried about him getting plucked from your practice squad at any time given the state of running backs around the league.