WoW is no longer an MMORPG technically, it's more a glorified lobby with instanced content to do. Matchmaking is almost fully automated. No doubt that in the future, more stuff will get automated matchmaking. Such as arena and perhaps normal to heroic raid difficulty.
And the other MMORPG's that come out, are too scared to innovate or adress the elephant in the room:
Datamining.
You see, the reason why World of Warcraft felt so beloved in our hearts was because we didn't have much information about the game during that time. We had to explore, we didn't have a wiki to say which areas were useful to go into. We just saw a cool tower and we felt the need to explore.
Right now, tons and tons of people just datamine every little bit of information available in the game before it can even reach live at some point and putting that all into a wiki. Theorycrafting it to death as a result. It's impossible for a game to have any secrets that the community has to work towards discovering.
MMORPG's are community driven, or atleast they should be. Nowadays, Blizzard artificially creates group content. Most of the players we encounter, we won't see again. Everything's phased or instanced. "WORLD" of warcraft, but most of the shit is phased/instanced, ironically.
Blizzard does not want the community to ever interact with eachother, unless it's at a high end level. Like mythic raiding. Most of the game is easily soloable thanks to automatic matchmaking, or the content being nihil or easy to complete that you don't need a group for it. (looking at you old raids)
And yes, a part of it is to blame with Blizzard still catering to E-sports and mythic raiders.
There is literally no reason to venture out into the world if you don't care about "MOUNTS, MOGS AND CHEEVOS". Once you get past a certain point of Ilvl, WQs become obsolete to do. Aswell as profession gear and the rest of the "world content".
Because ofcourse, if you had to go out and farm rep, let's say for an enchant on your gear that would boost your powerlevel, Mythic or high end players would complain they had to do said content and it would get datamined and put up on WoWhead for all to see anyway. So what's the point of adding such stuff in the first place?
Blizzard let WoWhead have too much influence on the game. There's no adventure or sense of exploration. No myths or legends. It's all datamined and put up on WoWhead. Player's don't need to interact with eachother anymore. They no longer need to ask eachother for help.
MMORPG's are just doomed to fail at this point.