For opponents of ObamaCare [the key date] is Dec. 31, 2013. That's when the individual mandate will go into effect. If ObamaCare hasn't been repealed by Congress or nullified in court by then, its opponents would be justified in urging Americans to refuse to buy coverage or pay fines and dare authorities to come after them.
By some estimates, Uncle Sam will need to hire an additional 17,000 IRS agents or so just to enforce the coverage mandate. But even if a few million Americans simultaneously refuse to abide by it, they could easily overwhelm the system.