So, people want to keep the feeling of vanilla WoW rightfully so, but how would you feel about a PVE prestige system?
Over the years dungeons and raiding have changed a lot: we got heroics, hard modes, and mythics. Comparably vanilla dungeons and raids are reasonably easy by these standards. Getting the gear and players might be a bit of trouble, however these fights weren't mechanically out of this world. Some were heavily overtuned and downright impossible, such as C'Thun, but this isn't the focus of this thread.
Would you as players want to see:
* All old world dungeons with an option to scale up to level 60 (nothing in between, no level 40 deadmines)
* Harder versions of this content in similar fashion to mythic+
* Increased difficulty could be implemented with bigger numbers, or with additional effects like mythic+
With this proposition in mind, I'm not proposing these dungeons give you better loot. The loot would stay entirely the same.
The purpose of this would simply be to provide players with more content and challenges when they reach the end game. It's not a catchup system, free loot system, or number expansion system.
Vanilla is its own experience in its own right, and I wouldn't want to detract from that; however I think it'd be nice to increase the amount of content for players at max level. That said, this system wouldn't need to be instantaneous. This is hardly an off-the-bat necessity, but rather something to increase options for players later down the line.