I don't think you can really can really blame lack of depth for who was playing wideout late in the game. As Warrior says, we were left with Hovey, Reilly, Pierson El, and Allen.
Bell, Westercamp, and Moore were real hurt. We lost two major contributors - Burtch and Turner - before the season even started. I think we're having some exceptionally bad injury luck at wideout this year.