They should just give up and delete the Merc subclass. Allow every Merc character to respec into a different class. BW consolidated servers to allow players on low pop servers to finally have access to endgame pvp. That was a good decision. For the same reason they should allow Merc toons to respec to a different class. 'Cuz no one is going to take a Merc dps on a ranked pvp team.
Mercs/mandos are still really good in PVE. So, only PVPers suffer. Like pvp? - play glowstick. End of story.