I think LLMs may actually help us get to CLI/API driven development. At least, that has been my experience.

Even though most of my projects have a UI, I build a CLI/API version so that the LLM can interact with it directly. I have been using this "CLI driven development" approach for more than a year now and have had fantastic results. The CLI arguments make it easy for LLM to interact with software it wrote.

I usually ask LLM to build a lib, then expose as a CLI and a RESTful API.

As a developer/user I hope for that outcome too — if everybody is using your app through an agent you might as well cut the maintenance cost and drop the GUI, or at least have a nice API alongside it to make it nicer for the agent. But I wonder what it does to the financial incentives to produce software.