What OP described reminds me of Dredgion from Aion. I played this instance for about year n half and I can say one thing. It was nightmare. People were abusing PVE mechanics (Traaaaaaain of mobs incoming). And game was designed so that you *Have* to play it quite often to get points for PVP (especially on high ranks where death outside of Dread in PVP meant loss of ten thousands PVP points).

So to make it short. PvPvE does NOT work. It is terrible dog-cat none truly enjoy (not in long run anyway).

#Opinion