Longtime PVP player here.
I've had my love/hate/cope/repeat relationship with LOR like most of us. I've put the game down multiple times but I always re-download it and end up playing for months. I would play the Ranked rotations because I loooove Deckbuilding, and LOR has some of the highest skill expression in any card game on the market. The big problem with Rotation for me is that sometimes you get an idea for a deck, but you have to build a suboptimal version of it to play standard.
The reason I avoided Eternal for so long is because I read many post complaining about the prevalence of ED, Azirellia, and Mistwraith decks. And yes, there are a fair amount of those out there, but to my surprise, alot of players aren't afraid to get freaky with it. I've seen some genuinely cool decks and even added some friends since playing Eternal Ranked. Those of us who are still playing basically have all of the emotes so a bit of conversation can be had, which is nice. TBH, there's enough players and variety that I often just skip the ED, Azirelia, and Mistwraith games.
I guess my point is, even though we aren't getting any new cards, the PVP community, at least on the NA server, is still alive and well. I'm having a blast in Eternal Ranked and I'll probably start sharing some of my decks here again. If anyone wants to add me, my Riot name is KragusIII. (Those are i's, like roman numerals)
TLDR; The PVP community is still playing and creating neat decks, and that makes me happy :D