Tablet computers are hot with 50 million expected to be sold this year and maybe double that number next year according to some analysts. They are part of the growing threat to the king of computers "The Desktop". Phones and Tablets and even Televisions can do so many of the functions we used to put on the PC. Even so desktops still sell at about a rate of about a million a day, which is seven times the current pace of Tablets.
Some computer experts say that they don't think Tablets can eliminate the desktop PC's because there are still technology that you need desktop power for such as gaming, editing, and other high end work. Desktops are also the place both at home and at work where people tend to create and store much of the material that gets loaded unto smaller devices. Foe example, an iPad does not have lot's of storage, and you can't really edit or work on things to the same flexibility you can with a PC.
But a growing acceptance of cloud storage is likely negate one major desktop advantage, some analysts predict that within five years mobile devices will pass desktops as our means of connecting to the Internet. PC makers are going to have to get a lot smarter about selling those devices to people, it's not dispensable anymore. Streamlined all in one models that pour everything into the monitor are just one effort to freshen up the traditional desktop. There will always be a market for desktop computers, but consumers will determine just how big that market remains.