I can't see Gwar going on without him. Or they may try but fail miserably. His sense of humor was one-of-a-kind. You could slap Devin Townsend or some other "funny guy" behind the mask and they'd be funny but not the same funny.
10/18 - King Diamond
10/24 - Pallbearer
11/01 - Suffocation
11/30 - Devin Townsend
12/06 - Distant Worlds: the Music of Final Fantasy