Nobody is claiming that human's won't have jobs simply because "we have accomplished everything this is to do". It's that humans will offer zero economic value compared to AI because AI gets so good and so cheap.
If there is some magic $10k AI that can fully replace a $200k software engineer then I'd love to see it. Until that happens this entire discussion is science fiction.
I think you have multiple offers of that very AI dangling in front of you, but you might be refusing to acknowledge them. One of the problems is the way you opt to frame the issue. Does "replacing" means firing the guy hoping to replace him with a Slack webhook? Or does it mean your team decides they don't need the same headcount of medior/senior engineers because a team of junior engineers mentored by someone focusing on quality ends up being more productive?
You acting like those two scenarios are the same is disingenuous. Fuck that.