people will not disappear overnight, using AI to make people more productive (like Excel did to accounting, ACad to architechture, safer cars and trailers for drivers ,etc.) is the way to go, replacing people it's a dangerous path to make precarious jobs and potential hacking to every aspect of our lives.
I'm not talking about what I
want to happen, but we should consider what happened to factory workers as automation improved. Today, you need like 1/10th as many factory workers as you did for the same factory output, back in the 1970's or so, yet the quality of manufactured goods has markedly improved. By analogy, enhancing IT workers of the future should mean the industry needs fewer of them/us. Businesses will embrace AI, in order to save money or increase revenues. I think those savings will come in the form of reduced labor costs, more than increased revenues, especially if everyone is doing it (because the total addressable market of most industries probably won't get much bigger).
As for the ecological impact, the carbon footprint of someone roughly scales with their salary - particularly in the range between the poor & middle class. So, if large numbers of us drop out of the middle class, you'd expect to see us have a smaller ecological impact. I'm not saying that's a worthwhile tradeoff, but if you imagine how certain people could justify the carbon footprint of deploying AI at greater scales, perhaps it's something they're taking into account. Who knows?