Since my name's been dropped I'll quickly chime in with a semi-vet PoV.
Despite my mixed feelings about the current state of PvP, I do believe some of it will be solved by just being able to PvP more again via interaction with players. When you barely get to pew, it's hard to get used to 9 years worth of iterations. That I fully admit, despite arguing my side regarding issues I have, is a me problem. Obviously.
However, the player population issue is not relevant to here, but it is an unfortunate symptom in my eyes. Won't change while everyone's up in arms with each other over balance though. Imagine being a new Discovery player, logging into the forums or taking a look in the Discord (or both), and seeing everyone spitting at each other over balance (among other things). Don't think you'd want to be part of that, and so the cycle continues.
I believe people could be kinder about it, and I believe the balance devs could be a bit more receptive to concerns from all levels of players. Impression I've gotten so far is it's a battle of who's more correct in regards to their own vision of PvP, and no agreement or compromise will ever be reached that way.
I do agree with the idea that things need to be kept simple though. You ain't gonna attract a consistent audience to a game this old if it's complex to get into. The newer generation especially ain't gonna put up with that.