You are correct. It is a problem that is specific to one small area of this country. There is no need to have a law that affects the entire country when the problem only occurs in one state.
As for the businesses that will take hard hits, I don't think that the snake market is a big enough chunk of Petsmart or Petco's bottom line to warrant them getting involved. The people who will be hit the hardest are the full time breeders of those specific snakes that will be banned.