Seriously.
Make the game highly customizable and let users spin up micro-realms with their best shot at configurables / balance for the way they want to play it. May the best few realms catch on as best of breeds, then there is plenty of options to play the patch you want to play.
Blizzard gets to then focus on the awesome assets and story they create with the occasion mechanic drops.
Its 2023 people can do this, gaming culture and understanding has advanced enough, even AI can do this… Look at the modded Minecraft community (at a conceptual level) as an example.