> So when should we start to be worried, as developers ?

I've been worrying ever since chatgpt 3 came out, it was shit at everything but it was amazing as well. And in the last 3 years the progress was incredible. I don't know if you "should" worry, worrying for the sake of it isn't helping much, but yes we should all be mentally prepared to the possibility we won't be able to make a living doing this X years from now. Could be 5, could be 10 , could be less than 5 even.