It’s not simple like that.
No matter how much one faction is superior, No matter how much logic there is behind changing factions.
Some people just enjoy a particular race or fantasy. And that’s ok! They shouldn’t have to give up playing the races they love just to be on the better faction.
If it isn’t clear, this matter affects me personally. The faction imbalance drove our guild Horde. And many of us are happier here.
The few that aren’t as happy know that the horde is better, but they miss their favorite races. It’s not their fault they like what they like.
This is a problem many people have to face. Play the race you want, or play with your friends. It’s not something anyone should have to experience.
Blizzard should fix it.