Why would revs not last? They're always going to be good money. And with more and more Craw's Bows Vig Maces coming into the game, they'll get cheaper and cheaper for regular players to eventually buy them, making revs even more profitable (for both PvMers and PKers).
I doubt we'll see any PvP updates anytime soon, but I could see something by mid-2019. Hopefully anyway.