The little bit most people ever do can be done on a mobile device. Most phones have grown to a size that lets them serve as canoe paddles in a pinch, cannibalizing much of the tablet market as well.

This means desktop computers as we know them will probably become speciality devices, and the same might be true for dedicated non-phone tablets. Laptops will probably really become niche products since they have most of the disadvantages of a desktop with few of the advantages.