Badly researched legislation written by people with no balanced knowledge of radio.
Well, the above, minus the radio part, describes most legislation, doesn't it? :-)
IIRC another state, Florida?, has a similar law on the books. FWIW, the Feds like to maintain full control over the RF spectrum, so I'm not sure how this is going to play out. Obviously IANAL, but from memory (working for a lawyer for a few years), the states are often allowed to pass more restrictive laws than the federal government. Auto emissions standards, for example (California). So it may be entirely possible for a state to ban what is legal under Part 15. It would be insane, of course, but that's never stopped states before. The Feds would then trot out the Interstate Commerce Clause, their one-size-fits-all constitutional trump card.
As with most laws, it will probably end up with the courts sorting things out. I'm not sure I'd want to be the lawyer trying to explain Part 15 to Clarence Thomas.