John Hunter: "Who is the bogeyman/enemy?"
I'd nominate the Uz first off, The Mostali could become involved in whatever it is that the orthodox Mostali are doing, The Garden could get expansionary impulses, Sables?, the reactionary Sundome faction, various Nomads seeking loot (good luck uniting even an Orlanthi all of that mob), Chaos (starting with Broo and going on up to Krashti or worse, the Devil, or part of him, could come out of the Puzzle Canal), Argrath could even become the enemy a'la Arkat.