I actually wrote an expansion idea that would fix the Horde’s neutering:
Granted my version is about war between the factions because that is what i like about Warcraft, but the basic premise would work even without that.
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Kill off characters that have served tgeir purpose for the narrative of WoW (or outlived it).
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Bring in old and new characters into the spotlight to create conflict within and between factions and the world. This means vested but different interests, allocation of resources or pholosophical differences.