I'm not certain Jevon's Paradox really applies here. We're not talking about mining coal or cutting down trees to meet increased demand - we're talking about a future in which software is mostly written by other software, and AI's capabilities will be improving faster than human developers can be educated. The scale of software demand may increase but more of that demand will be met by AI than by human beings.

So if the demand for developers increases at all, that increase will be minimal. And bear in mind that every aspect of every software process will be optimized as much as possible for AI automation, including languages used, so the set of work that "cannot be done by AI" will also be minimized.