Most high-court observers think it will strike down the individual mandate in the Act that requires almost everyone to buy health insurance, as violating the Commerce Clause of the Constitution — but will leave the rest of the new healthcare law intact....

If the Court strikes down the individual mandate, health insurance company lobbyists and executives will swarm Capitol Hill seeking to have the Act amended to remove the requirement that they insure people with pre-existing medical conditions.They’ll argue that without the mandate they can’t afford to cover pre-existing conditions.

But the requirement to cover pre-existing conditions has proven to be so popular with the public that Congress will be reluctant to scrap it.

This opens the way to a political bargain. Insurers might be let off the hook, for example, only if they support allowing every American, including those with pre-existing conditions, to choose Medicare, or something very much like Medicare. In effect, what was known during the debate over the bill as the “public option.”