LA is almost finished, an Arena starting there would be great, like Stadiums, Tyria having Arenas (Coliseum ?) would be another source of interaction with the world/cities and fame/money, even status.
This would solve the duel problem, players would challenge themselves, win prizes in gold, 1v1, 3v3, 5v5.
We need some Roman vibe in Gw2! 