Capitalism is the driver here. We will create machine to do things cheaply, and this will allow people to come up with new ideas using those cheap things and then do something else, because the something else can make them money.
All it takes is for a human to have an idea for something beyond that which the machines can do, and then start a business doing it. When humans run out of ideas, that’s when we’ll be in trouble. And historically that seems unlikely 🙂