Stacking professions
With a large population of players that would be viable; with a PvP population such small as in GW2, such proposition would lead to qeues so long that much of the players just will leave PvP annoyed.
I’m a fairly new player and I rather wait a bit longer and have a more balanced and fun pvp match then to get slaughtered 500 to 100 points several times in a row which actually discouraged me from going into gw2 pvp.