They were aiming for the stars with secure/slaughter 72 man queues (Alterac Valley status in WoW) which was a mistake from the very beginning. They should have realized the lack of interest for PvP while wolves den was active (which see's very little if any at all action now a days). Furthermore, expand on the reasons why PvP was/is unpopular and focus on that.

Secure is fine mostly, as is (although PvP-content being centric on PvE practices is terrible). Slaughter is a regurgitation of secure from a lazy PvP development team, and it shows. They literally took aspects of both Wolves Den (which is unpopular) and the terrible PvE aspects of secure, thru them in the same battleground map as secure and stuffed 72 people on a platform high in the sky. Knock backs are totally legit (take a note from Blizzard and remove knockbacks in Frontliens, they did it for a reason ;] ).

The complete and total removal of the Grand Companies would breath new life into frontlines - lowering queues dramatically (I speculate) because it would allow people who are deterred from queuing due to their GC sucking (flames), or not being able to queue with friends (lack of wanting to change GC's). You're bottle-necking your own content through Grand Companies, this isn't even an arguable point. I get it, lore, yadda yadda; it's irrelevant. Also, allow the group queue for the Daily Roulette (why is this not a thing?).

Sorry for going off on a ton of tangents, I am just venting some frustration for the pvp system in this game (which I would absolutely love to see addressed). All this is absolutely addressable and I believe would help way more than hurt. Overall PvP needs to be better balanced, get rid of the gimmicks, stop band-aid fixing it, and take into consideration the obvious.