The reason they cannot see the future is because they are looking to it through a false prism. There is an old expression, "Garbage in, garbage out".
These guys learned their economics from Keynes and so through their keynesian prism, they have no idea what is going to happen.
When you have a solid understanding of economics, economics is a science and when you properly understand it you can predict future outcomes. Like you can predict what is going to happen in chemestry if you mix a couple of chemicals together you know what the reaction is going to be.