There's an argument that changing laws doesn't change behavior. We see in currently, for just one example, in the argument that everyone will use their cell phones in their cars even if laws are changed.
But I went to Home Depot yesterday to buy some light bulbs. They didn't have a single old-fashioned incandescent bulb on their shelves. And the law doesn't go into effect for some time. I guess they don't want to take a chance on getting stuck with them.
Today I saw some on the shelves at the supermarket. I suspect that they don't have as rapid a turnover as Home Depot, though.