I hear people say this over and over again. Phones and tablets are going to replace desktop PCs.
That is silly.
A lot of people might prefer a tablet or phone. If you have a good tablet, you don’t need a desktop PC.
For people with lower computer literacy, they may get a tablet instead of a desktop.
However, for serious work, you need a real keyboard and a nice big monitor.
I suspect that most people will have both a phone and a desktop PC. Then, when you travel, you use your phone. At home, you use your desktop.
I really like my new phone, but I’m not giving up my PC and using it exclusively.