The amount of work is not a fixed number, it's more of a supply/demand curve. Do we need 100 programs? Yes definitely! 10k? Yes. 1m? Probably. 100m? Uhm... 1bn?

The amount of work is not a fixed number, it's more of a supply/demand curve. Do we need 100 programs? Yes definitely! 10k? Yes. 1m? Probably. 100m? Uhm... 1bn? Probably not. So there will always be a point where people aren't willing to hire more software developers because there are enough already.