It has everything to do with Obama’s promise. By not following through on his promise to legislate it into law, the opportunity to reverse the previous court decision was always a thing that could happen. Acting like them not taking the opportunity when they had it means its the fault of the voting public is pure bullshit.
Instead, Obama used his political capital to pass Romneycare, which while it helped a lot of poor people, has made the insurance market even worse for many, who still have insurance that they can’t afford to actually use.