I am sure Robiskie is fine as a wide receivers coach. This tweet from Paul Kuharksy is probably spot on:
Good for Robiskie. You never want anyone to be out of work, but I am really glad that Robiskie will not be the one calling the plays for the Titans next year.
Receivers coach is where Robiskie is probably the most comfortable. That was the role he was in with the Cleveland Browns, Miami Dolphins and Atlanta Falcons for 11 years before joining the Titans as offensive coordinator before the 2016 season.