Seems to me that the 10th Amendment is pretty straightforward. If a power is not given to the federal government specifically in the Constitution, then that power is reserved for the states. I've read through it and I'm not seeing anywhere where the Constitution says the federal government has the right to require its citizens to purchase something, namely healthcare. That being the case, its for the states to decide, and since some have decided that its illegal for the government to require its citizens to purchase something then the federal government can't go back and require it. That is, of course, unless there is another amendment passed, ratified by the states, that changes this.
If you go look at the Constitution there's also no specific mention of having a national air force, requiring a national retirement plan, or many other things that are explicitly constitutional. None of those things are for the states to decide, and they can rule them illegal as often as they like. They will be ignored.
Simply put, the Constitution doesn't work the way you think it does.
EDIT: Words have meaning. When you talk about passing a law and an amendment you mean very different things.