Why do you think a Great Depression 2.0 would return us to the 1800s? There is no reason why computers, electricity or even the Internet should suddenly disappear? Maybe some outages if some company that manages a part of the infrastructure collapses, however the know-how wouldn’t get lost and new structures would form.

You also contradict yourself in the first sentence. If billionaires don’t want a global crash that is (according to you) preceded by their beheading why should they try to accelerate this?