Kill the faction lock on grouping for PvP and PvE content while Warmode is turned off. The faction barrier is the most arbitrary at this point. Warmode can exist for classic red=dead gameplay.
Nothing can change other than absolutely broken balance, that would fix the population imbalance right now. The Horde community is too large, too expansive, and just dwarves the Alliance’s organized community. Balance would need to be absolutely insanely broken favoring the alliance for Horde players to abandon their community to play Aly.
The problem isn’t thoughput or aesthetics. The problem is community. Alliance is scattered, and there isn’t really a cohesive endgame community. There are more solo players, and players seeking transmog, cosmetic, or gold rewards. The Horde community is united in that it generally always wants to do group content.
The Horde community is social, it’s active, and it keeps growing. The Alliance community is cold, barren, and has a limit on growth.
Unlock the factions, the Alliance has a lethal cancer that’s existent on a community level, that won’t be fixed without Blizzard intervention.