I wouldn't encourage anyone to break the law. But I wonder if we wouldn't be better off if it became a well known fact that going armed into places that are posted is not a crime? It is a state forfeiture. That's not a crime, one cannot be sent to jail for it. In fact, unless the municipality adopted it as an ordinance only state law enforcement officers can enforce a state forfeiture. (One also cannot be sent to jail for violating local ordinances.) The worst that can happen is a fine max of $1K. I'm surprised at how many in the general public think violating those signs is a serious offense. Unless it's at a place like a court house, it isn't.
If you are carrying concealed how would anyone know? If you used it to save your life what would you care about a fine?
Once it became ingrained that those signs had no more bite than a parking ticket and people were carrying anyway, perhaps they would come down and we could end that sillyness.
Criminals ignore the signs, but you are not a criminal for ignoring it. A state forfeiture is not a crime.
I am not a lawyer, this is not legal advice, I am not telling you to break the law.