Austin is Rams second best player on offense behind Gurley.
I don't think he is great, but he is the best chance the Rams have in making a big play out of nothing.
If the Rams had a competent offense, I could understand your position. Get more of a solid WR that can catch the ball and move the chains, but the Rams offense doesn't create opportunities to make routine plays like other NFL offenses.
Hence, you need a player that could make a big play out of nothing if the defense makes a mistake. Austin provides this opportunity of creating something better than everybody but Gurley maybe.