What one thing could be added, removed, or changed in the game that would make you happy? It wouldn't fix everything in the game, but it would satisfy you personally for a long time.
It can't be something too broad like: "For PvP to be balanced!"
But it can be something like: "Guild Capes" or "Braham killed off" or "A certain class or weapon being more viable in PvP".
The ONE thing that would satisfy me is to finally have an Elemental/Arcane Longbow on Ele!