Given what GPT can already do, whatever it is that comes next, us software developers will have to start doing it too.

Software developers will be fine. Chatgpt is no where near replacing a mid-level developer. Maybe it could be different in 10-15 years. But right now, more often it simply outputs garbage once you up the complexity. Even if the output code was workable, one still has to make it fit into their larger code. Which still requires an understanding of how the code works.

Don’t get me wrong - chatgpt could be a great tool for learning. At the very least, it can teach a person on how to ask the right question.

We have no way of knowing how long it will take to replace us. A developer of a Go AI said much the same about Go two years before AlphaGo won:

"""After the match, I ask Coulom when a machine will win without a handicap. "I think maybe ten years," he says. "But I do not like to make predictions."""" - https://www.wired.com/2014/05/the-world-of-computer-go/

On the other hand, in 2009 I said "ten years" about consumer purchasable self driving cars good enough to not bother with a steering wheel, and that didn't happen. Seemed plausible to me even during the intervening years, given the videos Tesla was putting out. But, didn't happen.

But however long it takes, if companies like OpenAI et al can no longer benefit from humans rating the results (which is what I was replying to), then their AIs are going to be ready to replace us too.