I cannot speculate about this, because I am not sure too observe the same.

We've had writing for only around 6000 years. It shall pass.

Plus there are many contexts where you don't want to use your voice (public transport, night time with other people sleeping, noisy areas where a mic won't pick up your voice...).

And there are people that unfortunately cannot speak.

Well, there are people that cannot see.

Fortunately, there are solutions.

I want to add that I think you are missing my argument here. Devices that allow you to speak without speaking shall soon be available to us [0].

The important aspect of my position is to think about the relevance of "applications" and "programs" in the age of AI, and, as an exaggeration of what is shown in that post, I was wondering if in the end, UI is not bound to disappear.

[0] https://www.media.mit.edu/projects/alterego/overview/

What GP describes sounds to me like having a friend control the computer and dictate to them what to do.

No matter how capable the friend it, it's oftentimes easier to do a task directly in a UI rather than to have to verbalize it to someone else.