None of them -- sans Aubrey via reality TV -- has had any success outside of the group itself. Even Aubrey hasn't had much success in music, so the reunion would do wonders for them.
As much as I want this to happen, it probably won't. D.woods clearly wants nothing to do with Dawn, Shannon is doing her country thing even though it won't be very successful or noticed and Drea is nowhere to be found. I know she's doing things but she doesn't have a twitter and not easily accessible. The best I can hope for is a Dawn and Aubrey song.