Imagine 100 years from now when humanity's population has been reduced by 100s of millions because of climate catastrophe. Now imagine all the software society relies upon. Now imagine being one of the few people left alive being capable of working on that software. You probably won't have source code.

One thing that has remained constant in our lives is the number of people who are capabable of working on complex software has steadily increased. What happens if that number suddenly decreases?