After the first 3 Scary Movies had success parody movies became extremely over saturated in Hollywood. Plus parody was still airing on shows like SNL and MadTV. The quality severely dipped and people moved on plus a lot of parody content would move on to RU-vid with other content creators who targeted specific brands of humor before that faded too.
Did Charlie Sheen, Kevin Hart, Anthony Anderson, Regina Hall, Anna Farris, Simon Rex and Leslie Neilson know who Tom Kenny was when he came into the studio? Most of his work is voice over then on camera, and you barely see his face.