I agree.
I also disagree with the PPs assertion that computers are only to reduce need for workers. That's very wrong in so many ways. Computers and technology are used as aids virtually everywhere and in everything to improve things.
Such as computers in cars - they're not replacing a human driving it - they're "helping" a human to drive it, i.e. safety sensors, controlling the engine, brakes, gear box in automatics, even the radio/USB player. Same with virtually all electronic household appliances - all are "aids" to the occupants whether a fridge freezer, microwave, TV, washing machine. Even entertainment - everything you could ever want to watch or read at your fingertips because of the computer in your smart phone.
The world of work will change, that's for certain, just as it did in the industrial revolution, where likewise some people were wailing that there'd be no jobs. Back then no one could have imagined the millions of jobs created in the entertainment and hospitality industry, supermarkets, warehouses, the automotive and trucking industry, the global mass shipping, the aviation industry, the IT industry - entire industries employing millions and billions of people that simply hadn't existed at the dawn of the industrial revolution.
What people need to realise is that "skills" will change. Back before the industrial revolution the "skills" for success for most people was farming and allied industries along with looking after themselves, although of course there was also shipbuilding and military in some areas.
I think the biggest risk area will be administrative, pen pushers, middle management, etc. We've had automation taking over production lines and unskilled mass manual work, i.e. work done in factories etc. I think the next phase will be taking over work done in office blocks and call centres - administrative and middle management tasks are ripe for AI to take over. Second to that will be the retail industry as there'll be less and less need for workers in shops, and less need for shops, due to the ongoing growth in online shopping, and that trend will continue even without AI.
I think manual workers, semi skilled, i.e. tradesmen, mechanics, drivers, etc, will generally survive for a few generations yet, and that will probably be a growth industry to support AI and technological advances in green energy, robotic construction methods, etc.
Professionals and highly skilled workers, engineers, etc., again, probably safe for a while yet, as we still need people to check over the output of AI and be creative with new "things".
There'll also always be a need for entertainment (inc sports), hospitality, "personal" services, i.e. hairdressers, nail bars, massage therapists, sports therapists, gardeners, cleaners, etc., and also obviously health and care workers.
So, in summary, I think it will be polarised. Those who can do something "physical" using their manual skills and/or strength will be OK. At the other end, those with professional level skills and abilities will be OK if they can adapt and have transferrable skills as AI develops. It's those in the middle who are most at risk - and I think it would be wise to ensure our children don't end up in that group by encouraging them into some kind of manual/skilled hands on work OR a higher level professional type of work.
Those of our children most at risk, sadly, I think will be the likes of Jemima who goes to Uni for an unspecific (unspecific to a particular career) degree and then gets a job as a council administrator or an NHS administrator etc. - i.e. a job they didn't actually need a degree for, with a degree that doesn't have a particular career path. Not only are such jobs at the highest risk of disappearing, the person doesn't have an obvious alternative career path and is competing with huge numbers of other people in the same position.
Really is time for hard talks with our children and turn them away from getting a non career specific degree and going to Uni for the experience. Get them either on a proper career path with a specific degree, or get them into vocational training for a more manual/hands on or skill based trade. Time to train our girls to be electricians and plumbers rather than HR assistants!