I don't regard it as an exploit. The players on that team are not doing something unintended in the game. They are using an existing game mechanic to extreme effect. That said, I'm not sure I have a good answer for how they will patch it, but it will probably be something like removing orb generation from PvP altogether. Someone else even suggested putting the Titan Defender super on a mandatory cooldown, but that has PvE implications. Or, they could implement a ladder system so that teams like that would be separated from the average rank and file of PvP players, but that obviously wouldn't be a quick fix. Regardless, it's something they will have to address one way or another.