I am not saying that he'll die right now, only that he will probably die before he has a chance to become the sixth member of the Order, so before Belkar dies or soon enough after. Minrah may also survive, but also not become the sixth member because Belkar dies shorty before Xykon and Redcloak are defeated and there's no more need to have an Order of the Stick, but I consider this less likely.
Update: More relevantly to this thread. In #415 third panel, Xykon says "TeeVo" with a capital "V", but this thread lists them as "Teevo" with a small "v". Is this deliberate, and where does the latter come from?