Good. They never should have existed without strict regulation to begin with. They are needlessly unhealthy, and only created to make the owners wealthy while paying employees the bare minimum required by law. In many restaurants because of the tip culture, they convinced government to let them pay even less.
Most of these types fought any minimum wage when it was being pushed for. They said a minimum wage would put them out of business also. The by product of capitalism is poverty, misery, slavery, and debt. It is designed so you have a winner and a loser. I hope to live to see the last of the Fast Food chains, and the end of Capitalism.