First of all, Sorry that i will refer another game, but its just to give the idea behind it.
World of Warcraft PVP System based on Arena was fun, i’d like to see this in GW2 aswell
So apart from WvW and Conquest, just an Arena version wich means the only Objective would be to eliminate your enemy team (3v3) would be perfect (4v4) and (5v5) works aswell, In a regular Arena match it just would be 1 match and with ELO rating, However this would even be a possible idea to even bring this idea up to the eSports scene?
In esports scene this would make it; Best of 3 or Best of 5 in finals etc…