Drivers license, pilots license, concealed carry license, medical license, law license ......reciprocity .
Constitutional carry, nation wide would be icing on the constitutional cake imho.
As an aside, medical and law licenses have no reciprocity. A doctor or lawyer moving to another state must take a medical or bar exam before they are allowed to practice.
And typically, driver’s licenses are recognized until six months’ residency, when many states regard their holders as residents and require them to get in state licenses. This is for tax (and instate college tuition) purposes.