If you can’t get cheap medical coverage, or you don’t get a subsidy for your medical coverage, then you have been hurt and have standing to sue. If your medical insurer uses “pre-existing condition” against you and PPACA says they can’t, you have standing to sue. If the government refuses to offer you an exchange full of medical choices, and the law says they must, you have standing to sue.
If the administration decides not to collect penalty taxes from employers who don’t provide sufficient coverage, then I guess an administration can fail to collect money; if they decide not to collect from healthy individuals who decide not to buy insurance, they can.
So basically, there are a few limited opportunities for the government to forego a significant amount of money, and leave people without medical insurance to sort out any debt mess they get into… but a lot of the provisions will HAVE to go into effect. Giving large employers a free ride in skipping health care obligations will certainly be a vote-getter… for somebody.