As far as I know, there is no federal mandate in any comparable law. The proponents of the law bring up car insurance for drivers as a mandate, but that’s a state mandate, not federal. And no one is mandated to enroll in and accept medicare or medicaid. I think there is a pretty clear set of grounds for this lawsuit to proceed. Anything not permitted in the constitution is reserved for the states, and since this is nowhere in the constitution, it’s a states-rights issue. I predict the lawsuit goes ahead and goes pretty far. Can’t say it will win, but if I were betting I’d say there’s greater than a 50% chance that the states win.
Not to mention you don't have to drive on public roads and you don't have to own a car. However, if you want simply to be alive, you WILL have to buy mandated insurance. This section will not stand.