They have added war-mode and alliance got more rewards from it, most of alliance just not bothered to turn it on. Half of top 10 pop alliance realms were PVE while only 3/10 realms are PvP. in US 6/10 top alliance pop realms are pve 3/10 Horde again. Alliance players don't like world pvp. How can u fix that? Oh yeah, by putting restrictions on realms and factions. No thx and that would never work. There are only few balanced servers and others are at a big disbalance, either horde or alliance winning by a large margin. Also those realms tend to have the most population overall.
You have one idea which "would totally work" and yet you ignore any stronger arguments and just straight up insult people.