If players are going AFK during PvP scenarios just to collect the points that their teammates are collecting why don't they send the players to "limbo" as soon as they are inactive? If they are legitimately AFK then when they come back they can resume earning the points.
It's been since launch since i played the game but that was just a quick solution off the top of my head. I had fun with the RvR but the rest of the game got stale for me just like others have said.