Humans have several millennia of evolution "touching things" for tactile feedback. Mice on the other hand are a relative (and quite useful) hack compared to that. It requires training and a different mental dimensional model to use. To a child growing up with modern touch screens, a screen without touch is the aberration and "broken". Mice may not disappear entirely, but certainly more and more screens in our lives will support touch interactions, even on desktops and "non-mobile computers", simply because it requires less training and feels more natural ("touch the button" versus "move the mouse to the button and click" may not seem that different after decades of mouse usage, but are very different experiences to an untrained person). There's a sense already today that kids growing up with tablets find mice strange and annoying ("Why can't I just touch that?"), and it's easy to wonder watching today's kids if mice will last for more than a footnote in history and in increasingly small niches that require "headshot precision" like games and maybe CAD.
