The only arguments i see for the retention of the faction system boils down to "i dont like change". I havnt seen a single meaningful argument for the factions that doesnt fall into this category.
Offer some GAME PLAY reasons for keeping the factions split, and i might consider them, and by all means prove me wrong about not liking change, but i am yet to see one.
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What do you like about it? Could these things remain in a world were the factions have a ceasefire? I mean we already have alliance Vs alliance and Horde vs Horde in pvp, i have always been a big fan of promoting the idea that the faction war ends, the factions come to an uneasy truce, and bgs and arenas become proving ground and training grounds, and you can queue for mixed faction or traditional. I am pretty confident the mixed faction would be more popular and have shorter queues.