From Lace Valeria:
The Frontline Roulette didn't kill Rival Wings. It died LONG before that due to players adopting poor strategies early and stubbornly clinging to them, exploiting job balancing (i.e. healer stacking), poor sportsmanship (giving up early, afking, being "just here for XP/wolf marks/tomes"), and some of the poor changes made to the mode itself. Skilled players got their wins for their mount, and left the players who didn't want to listen or cooperate to deal with each other and the mode died as expected.
Now then, as for the matter of GC/Freelancer queues, as I previously said both here and many times on Reddit, since 4.0 we've had a compounding issue of people believing they have to be in one particular GC - let's not be coy: Maelstrom - in order to win. They'll switch to Mael, turn OFF Freelancer, and never queue in a full party, so they'll only ever be on Maelstrom in a match, which basically lets them apply the premade concept, but bypass forced Freelancer status. There's nothing saying they can't, but it's a bit underhanded. This problem has truly snowballed in Primal data center, while it's come up in Aether, but hasn't been allowed to grow nearly as much.(edited)
It also doesn't solve the core problem that the remaining teams face: People largely just don't know what to do. Nor do they seem to care to learn, and being forced to always be on a team that wouldn't have the coordination shown by people who exclusively queue for Maelstrom and do know what to do would only serve to further demoralize and either drive people away from Frontlines altogether, or worse, resort to things like botting/afking just for XP "participation" rewards.
The answer isn't to remove GCs. Honestly, they could change the colors and call each team the Temple Knights, the Doman Liberation Front, and the Ala Mihgan Resistance and it still wouldn't matter. I personally am in favor of a forced Freelancer for all, and I say this because not only does it immediately erase the placebo fix of piling into one GC, it would hold every player personally responsible for knowing what to do and push them to work together if they want to win, rather than trying to stack one team favorably. That too, is part of why others premade. It's time to really, properly look at things.