I've been an off-and-on World of Warcraft player since the Burning Crusade days, and I honestly think that Blizzard is struggling to evolve the MMORPG genre into something suitable for the modern day.
There was a great article in Kotaku[1] that illustrated this quite nicely. Essentially, what made World of Warcraft successful when it launched can't really exist today, especially with our hyper-connected world. Blizzard has made many attempts to make World of Warcraft more modern, more accessible to newer players (and some have even worked!), but nothing they've done has been able to recapture people in the same manner as it did originally. I think this isn't so much Blizzard's fault as it's just a factor of our world now; there's so much competition for our attention that the "average" gamer doesn't really have the motivation to immerse themselves into the game world (nor can they really when there's so much research you end up doing while playing).
The last truly transformational gaming experience I had was with The Legend of Zelda: Breath of the Wild back in 2017. I suspect much of that experience was due to the fact that, in those crucial first few days, there wasn't really anything online about the game. (Sure, there were articles here and there, but nothing near the vast amounts of information about World of Warcraft that exist now). To a lesser extent, I think a lot of the experience I had was due to the single-player nature of the game.
I've said this for years, and I still stand by it: Blizzard should create single-player games set in the Warcraft universe in the vein of Skyrim. They've spent so much time and effort crafting these elaborate stories and worlds that I think the best way to really experience them now is with a single-player game. I could be convinced to accept a group-up mechanic for larger enemies (sort of in the vein of Monster Hunter), but a single-player narrative-driven game set in the Warcraft universe (with art done by the cinematics team) could be a blockbuster if done correctly.
However, there's no indication that Blizard cares about crafting that sort of experience anymore. They seem to be almost commpletely focused on multiplayer, microtransaction-based gaming, which is probably the way to be the most profitable these days I guess.
[1] https://kotaku.com/world-of-warcraft-classic-maybe-you-cant-...