Well articulated. I tend to think that the outcome will vary hugely by project. We already observe this with some reporting certain models behave in a certain way, whilst others see the opposite.
To use the wooley term “quality”, the top 20% might stand a good chance of making huge strides. But the remaining 80% of projects (in particular the bottom 20%) will atrophy extremely quickly. Yet, these will be the project that many push LLM’s too as their domain/technology is complex and/or outdated. Digital transformations that can be done quickly will be tantalising but ultimately unsatisfactory long term (as you describe).