The particular problem here is the past has very little predictive power on when something is going to happen in the future.

There were plenty of people in 1890 saying heavier than air powered flight was never going to happen.

>humans love to do things, just for the sake of them.

This said, it doesn't prove a negative. How many things would people be doing if they could get paid for it. It's easy to say these things in generalities, but you do any specific things, especially for a living, those could dry up and disappear.