They've shown a propensity to hang onto some players not because of their contributions, but because of the investment made in them. LJ Collier making the team and taking snaps away from Myles Adams last season is a recent, resonant example. Adams was dynamite in the preseason.
I have little doubt that he'll make the roster, and probably at the expense of a better football player like Cade Johnson or a late-round rookie. But I'll happily eat crow if I'm wrong. (Tyler Locket singled out Johnson as a player to watch this season, for what it's worth.)
They're certainly not foolish enough to count on Eskridge to finally claim that third wide receiver role. The roster spot would be better used on a younger player that has more special teams value--kick coverage, particularly.