+1. The 2x XP rate allowed many players to come and try the PvP server on Turtle WoW and establish themselves there. Not everyone has the time or motivation to level another character to 60 at 1x after losing our characters on Turtle WoW. In my opinion, bringing back the 2x XP rate would encourage many players to join the PVP realm.
On top of that, it would give the PvP server a genuine identity and help differentiate it from the PvE server.