How about people stop having their fun by standing perfectly still in a public area? Then the discoballs won't affect their avatar at all. If your idea of fun is standing still in Quark's or w/e, perhaps it's not the tragedy you claim that it's "ruined" by something so innocuous as a different idle animation...
I thought that you couldn't get forced to dance if you move/take actions. Why are so many people so determined to stand in one place for long periods of time? And if you're just standing there, why does it matter what your avatar's doing, as blatantly you're not concentrating on it, but something else...?