There were too many small factors that came together to make wow classic fail as a long term version of the game. For one, it’s not new content in any way so everyone knows all the mechanics and how to exploit it. Two, the timegated releases were terrible because the game really needed bg’s and bwl to give enough content for people to do. Three, having an unchanging static version of the game is boring because you know your class is never going to receive any balance changes.
There’s honestly more things that are issues… back in vanilla realm forums built community, you had the pvp ranks on the website so you knew who was at the top, servers weren’t massive layer fests so you actually knew who people were on your server… it’s just not the same experience.
So, I think classic wow is dying and it will slowly die and bleed population mainly due to the lack of new/repeatable content and server communities not being built. And people will spam “you think you do but you dont” like they somehow won some personal war, but the real losers are us as far as mmo’s… because there’s no way I’m going to play retail again.