Well, that’s an interesting point. Kurinnaxx is looking like about 50:50 according to the raid logs, but some people are reporting that it already is that sort of a wasteland.
I don’t know what others are doing about it, but personally I have abandoned all my Horde characters, and am Alliance on one of the most severely imbalanced servers (according to whatever data I could find), and we’ll see how that goes.
My personal thoughts on what others can do, if they feel so inclined to do anything is something like: