In reality, I find mobile super useful for light-duty computing, which amounts to about 80% of my computing needs. For reading, or watching informational video, or listening to audio, or voice communication. Mobile excels in SMS text, which is the only relatively brief and un-cluttered means of networked communicatons left thanks to capitalism driving advertising everywhere else online. However, as soon as information becomes complex, or writing requires length and eloquence, there is no substitute for a full keyboard and large screen. Certainly mobile apps can't compete with full desktop programs in terms of flexibility and deep functionality. Mobile excels at the brief, portable, and shallow. Desktop excels at intricate, detailed, rich, and comfortable. They are different things. Maybe, if you could get a PC to recognize cursive handwriting, you might take a stab at replacing keyboards. Better speech recognition might do some, but written communication comes from a different part of the brain. Vocal people do not understand textual people and our need for reading and writing. Forcing an end to textuality would silence many brilliant voices. Handwriting recognition, however, could also be a security feature. Handwriting is unique to an individual. It's like a literary fingerprint. In the end, I find a forced merger of desktop and mobile to be ignorant of the variety of purpose humans have in the computing they do. Having the same data accessible across device platforms, however, is entirely useful.