I don't see this happening for everything.

For instance; I don't think LLMs will be replacing Spotify, Facebook, Insta, or Youtube for my parents. They absolutely do not want to purely interact with a blackbox. They want to scroll through songs/shows/etc. they want to tap on it, and have the app do the thing.

Even as a SWE, I have absolutely zero desire to interact with an LLM for everything, but I'm not the litmus. I have found use with these tools for taking on some nested set of tasks, but at no point do I want to give up the app entirely.