So Warsong is effectively dead with only 150 players on it max at any given moment. However, these are still 150 people who may be paying users and warmane consumers, so we shouldn't be ignored.
Why not merge us with Neltharion, and before doing so run a replace script replacing all of the cataclysmic gear with ruthless gear, and the pve gear to a ilvl 378 equivalent? Alternatively, just delete all of our PvE gear and let us keep our PvP gear.
Back when I was a GM of Arena-tournament we ran a similar script to roll-back gear to a previous season, I still have those same "replace" scripts in a google doc if would need be.
Consolidate to stay strong, instead of slowly losing users that may have contributed to the server in the past, or may do so in the future.
Force everyone to rename upon transfer as well, if their name is taken then too bad. If not, they can just take it again.