I partially agree. My terrible pun of including Excel was a reference to a very common application that's not going ubiquitous or backgrounded anytime soon. Similarly, nobody's soon going to be coding via a voice-drive device without a display.

On the mobile side, imagine the hellscape of privacy intrusion that would result if people all used voice to message each other (instead of text/email/etc).

GUIs are sticking around because they are the best available option for many use cases. Portable GUIs are likewise going to stick around for a long time. Fashionable nerds may decide to stop calling these "PCs" or "mobile phones" at some point, but the form factors will prove resilient.