In general, I'm not thrilled at the idea of protesting through currently illegal tax withholding. More importantly, I believe the time is right for a proper full-frontal attack on totalitarianism through the elections. More importantly, though, is for the politicians to communicate to their consituency on why such taxes are oppressive, and we have a far better chance in the upcoming cycle.
But the tax withholding scheme, while emotionally popular, will have even less effect on policy than third party political organizations, for promoting our ideals.