Teacher friends say they see kids not knowing how to use a mouse and jabbing at the (non touch) screen instead, which is kind of what I’d expect my computer-phobe parents to do.
Knowing how to use a few apps is not digital literacy.
That said, why don't most computers have touch screens by now? For many, many users, a touch screen is a far more accessible and intuitive way of using a device. My elderly grandparents can use a touchscreen but don't have the dexterity to use a mouse.
But I'm not saying computers should go touchscreen only, just that it's probably time that a touchscreen is a standard feature on desktops and laptops. Microsoft Surface and Lenovo Yoga seem to be well liked by their users, yet there are very few desktop touchscreen monitors on the market.
A touchscreen is just another input option, and you could continue to use your mouse and keyboard if you prefer. I certainly would stick to my kb/m - even if that makes me an old fuddy-duddy.