A lot of states will hold out on Obamacare and rightfully should do so if they do not like what the feds have done and the SCOTUS ruling. If you don't like your states' laws, you can move. Ask anybody in America if abortion is legal, and unless they are from one of the 13 states that said "fuck you to SCOTUS", they will reply, "yes, it is legal", because they are ignorant. Proof enough it will happen.
If threatened with $$ witholding from the feds, the state's always have the options of pushing back in the form of legalizing and taxing all of the liberties that the feds have taken away from us (gambling, drugs, prostitution, etc.), and funding their coffers on their own. Imagine Texas with the border lined with pot shops, casino's and brothels, they would be by far the richest state in the Union and wouldn't need the feds $$'s.