They gotta get things balanced to a point where all specs have similar “power” just some are tankier and some do more damage. Some do their damage in one hit, some do their damage in a bunch of smaller hits. Then they gotta add a source of standardized PvP gear (like in modern wow).
Then we can start developing a healthy PvP scene.
If LS sorc, or whatever barbarian is favored that patch does like 100x more damage than the next best thing there’s no point in PvPing.