The most ironic thing is that people who do the hard work are unlikely to be obsoleted any time soon. At least in third-world countries. Theoretically you can build robot today to replace janitors, plumbers or serviceme but it just too expensive and does not scale.

But replacing computer operators is scalable. So I definitely expect most office people including low skilled developers to be replaced by AI in a 20 years. High-skilled developers might survive (and I'm not sure if I'd qualify) but obviously for most workers that's not very encouraging.