I do agree that a lot of engineers who want to do everything the old manual way are about to get really frustrated.
I don't think this is as universal as you say. There are a lot of engineers who are excited and happy to use these tools. Leave the bubbles of Hacker News, Lobsters, and similar sites and a lot of people are embracing these tools.
You also skipped the step where someone needs to direct the design. In the pre-LLM era it was commonly accepted that engineers who advanced to very senior roles would become less connected to the implementation details and more connected to steering, reviewing, and directing. Only a few years ago Hacker News was full of anecdotes about staff engineers who barely wrote code any more. Those people will have no problem switching to a new world where LLMs are handling implementation details.
Why people are so eager to surrender their birthright to the machines for the mess of pottage?