Well. Before the law, we used to drive on all season tires and there wasn't much problem. Then the government imposed that law which forces everybody to use winter tires. We now use-up more tires than ever before.
They said it was for safety but I have the feeling it didn't change much in the end. People feel "safe" with snow grips on their cars and drive a lot faster than what would be safe no matter the weather. Winter tires are absolutely the worse when it comes to fuel economy and storing spare tires is a big pain on either the yard or the wallet if you rent storage space for them. We have three cars at home. That means 12 tires in the backyard.
In the end, I have the feeling it wasn't really worth it.