For years I've said they can't do this because of all the progress/achievements people have made in the game.
After BFA, I've changed my mind. Yes, we need WoW 2.0.
This is a marketing tactic. The same reason one would choose to release Overwatch 2 instead of just patching the original game. It also works. Or do you think they should stop making new Maddens and just keep current one?
WoW 2 should also work on consoles, especially with the PS5 coming out.
The biggest buzz one could create around WoW is WoW 2. Anything else, expansions, changes, ect, mostly only appeal to current and possibly previous players. BFA probably reduced those, it would be a great time for a new MMO, and Blizzard could build it from scratch.
Should we dare to even hope for this? IMO, blizzard needs a reimagining of much of the current game, not a recreation of classic, something completely different. Be bold. BFA is a flop. Use it as an excuse to try something crazy, not more of the same. Take the basic concepts of the genre and change everything else. Give us a new engine, or even give us the Overwatch engine, that would be sweet. Imagine a MMO with overwatch graphics and wow gameplay.