What gauge gimmick though? Most of them don't even qualify as that, it's just building gauge and using it on one skill or it's AoE version. Then they can have fluff like free charges of that skill and whatever, but it's mostly identical.
That includes WAR, DRK, SCH, NIN, SAM (to be fair, you use Kenki for gap closer and for disengage), RPR is all about these bland gauges, MCH and I probably missed some. None of these have any real gimmick or mechanic behind it, you just build gauge and spend it on one skill. If your meme about 7.0 would become true, it could end up being an upgrade. But I doubt they will not double down on 2min meta, because not only it has made game terrible for players, but it also made it bad for developers to balance all the outstanding variance and other side effects.