This is always the case for PVP games that have power creeps connected to grinding, its also one of the things that keeps PVP centered MMORPGs niche market.
I think back to darkfall, that game was such a wonder to play when Darkfall 1 first released and the server was rather close to each other in terms of leveling + skill. Said game had tons of skills, no skill cap so what happened?
People power leveled, got OP, rekted everything, which made all the other PVPers go into PVE grind mode. The grind was so long for new players coming in that they refused to stay after they have been ganked and looted by OP older players that have nothing better to do then camp noob spawns since no one is PVP'ing other then the elite few who power leveled.
Its a vicous cycle.. hardcore players grind hard, troll the casuals, make the casuals quit, try to hold on with low pop numbers, then quit themselves and complain about pop numbers blaming the devs for something they created.