No. Just no. I love using a desktop pc
Actually for most other people, tablets probably would be a pretty good idea. The only things that they would need from a computer is to surf the web and to read documents (notice how they don't write any documents, just read). And that's pretty good, but I don't know if it justifies the hype that people have been giving them.
Touchscreen computers have been around for a very long time. They even existed before there was Windows! Touch is a pain in the ass. You get the screen smudged. You might hit the wrong icon. The tap you may have made may not have registered. The swipe that you thought you made accidentally opened up something you might not wanted to show. They just don't provide the nice usage that you can get with a cheap laptop (yes, the laptops are cheaper) or a mobile phone (small enough to fit in your pocket )
I personally find that interfaces for tablets should definitely be used for the general populace. These are people who need a design that is simple enough for a child to figure out because a lot of these people act like children. While I don't think that the touch screen itself is a necessary component, being able to easily open an app (btw, there were applications before tablets and smartphones), and share photos with the rest of your family will make almost all computer users happy.
Tablets: good for web browsing and document viewing. Don't expect to solve the meaning of life with it though.