I highly doubt that a significant portion of farm labor became salesman or researchers. Builders? I could see that but robots already replaced a portion of those too.

Well, if that's the case, then in your concept the issue isn't what will happen to the programmers, but rather to all the work in general.

That's how it always happens. Technology advances, and there are more jobs than we're displaced. That's why technology keeps getting better AND the number of jobs keeps increasing with population.

less jobs creation is a almost certain for tech, but some people with high IQ get wayy more things done, they already do. This will spread to robots and other areas because robots are not automous yet, maybe will take decade(s). but meanwhile few operators will lead them in a more productive way? That's my bet. It's a clear, logical process with iterations. A lot of things are getting faster with AI, except energy production in some places in the world!

Why do you think less jobs creation is certain? We have more jobs now than we did before tech...

if AI get advanced, it only makes certain % of the engineers and related jobs wayy more productive, not everyone. This is already happening, it will grow from here or AI and LLMs stop advancing

Everyone always assumes this, and it's always wrong. There is an infinite amount of work to do, and the more complex that work gets, the MORE people get employed.