Listening to possible arguments on the radio and one good one was signing a contract under duress. If the government can force you buy something then you are not a willing partner to that contract. If upheld that would change contract law forever and who knows what else the government can tell us to buy....like a Volt! Or broccoli!
Well, the government forcing you to buy something is a violation of the Commerce Clause of the US Constitution.
That’s a thoughtful argument. The potential impact upon contract law is a serious one.