Season Of Mastery
We know that the Season of Mastery makes some changes to the WoW Classic formula, and those changes are aimed at a faster paced leveling experience and a more challenging feel to raid encounters that players basically blew through when WoW Classic dropped in 2019.
I don't know if it would work, but between Mythic+ dungeons, World Quests, and the way Torghast apes Nephalem Rifts, there's already quite a bit of Diablo 3 in World of Warcraft nowadays.
WoW Classic will introduce the new Season of Mastery November 16, which promises to be a fresh restart of the game with faster leveling and more challenging bosses.
There are some big things on the horizon for World of Warcraft Classic.