NOTHING has been overturned. That's the problem. It's still just as illegal as it ever was.Staying silent on issues results in those issues never getting challenged and overturned.
Eliminating crimes at the state level can not legalize things that are federal crimes. These laws don't create any sort of a "challenge". MAYBE, if some person violates one of these federal laws, they MIGHT get their case elevated after conviction, all the way to the Supreme Court where the Supreme Court MIGHT agree to hear the case and MIGHT overturn the law. Then the person wouldn't have to go to jail and the law would be changed. But that overturning wouldn't be based on the fact that their State has "legalized" the activity in question, it would be because the federal law was unconstitutional. In other words, the State law wouldn't be the deciding factor in the federal law being overturned, even in a case like that.States are now challenging numerous things.
In other words, these State laws do not actually create any sort of a "challenge" to federal law.
I haven't done a study of the topic, but I believe that is correct.Historically speaking, gun free zones weren't a thing.