If he’s injury prone, with a limited sample size, why do you think he could fetch a lot of money on the open market?
Bills are in win now mode. See Von Miller. It’s not desperate, it’s putting all chips in. Beane won’t do it just to do it. If he could get Barkley at the right price he would consider it if there’s an injury necessity.
As it stands, the running game issues are offensive line related, not RB related (at least this past Sunday). So I doubt we see Beane trade for Barkley.