It's not up to the court to decide if it's a good law, just if it's unconstitutional or not. Congress can pass a law requiring insurance companies to cover pre-existing conditions if they want. The fact that it would bankrupt the insurance industry doesn't make it unconstitional. That would probably get Obama where he wants to go faster, allowing him to declare health insurance has failed and it's time to go single payer.
Best response of the day. The administration wins either way. The ultimate goal of the existing law was to create such a monstrosity that the only way out is a clear cut health care tax and single payor. Even if the entire law is thrown out, I doubt the GOP-E would hold their ground and do nothing. The One has learned triangulation very well from the master, Slick Willie.