I see two points:

1. AIs aren't yet good at architecture.

2. AIs aren't yet good at imagining technically exciting stuff to build.

And I agree that there's still space there to build a career in the short to medium term (plus Jevons Paradox). When both those points are no longer true we are certainly much closer to, dear I say it, agi. I suspect that (1) will be solved for somewhat limited domains in the near future using harnesses. And it could snowball from there.