If you look at the total population then the the factions are quite balanced, but it is skewed at the top, but the top is very tiny.
The number of subs that Blizzard loses from people like you is tiny compared to the number of subs Blizzard would lose if factions were removed as faction rivalry/identity are a huge part of the draw for casual players.
And the casual players who are the vast majority don't give a flying fuck about faction balance. On my shit server there are plenty of normal and heroic alliance guilds, whereas us that do mythic raiding have a problem, but we are a minority.
So use a fraction of your 50 million+ gold to transfer to Silvermoon.