Right now the tendency is towards tablet PCs and mobile platforms, such as Android. I can't see them replacing PCs any time soon, though, because a lot of tasks can't be performed using these devices. We'll have to wait for something fully-functional to appear.
In the short term, say, 20 to 100 years, I think it will be a quantum computer.
And if we are to venture into the era of enlightenment, in about a thousand years from now, I think people will realize they do not need an apparatus, which is doomed to be faulty and corrupting, to do their thinking or calculations for them.
More precisely, people will remember that they harbor the connection to the Absolute inside of them, which stores, and can retrieve all the information from all the universes, ever recorded, without the need for a machine of any kind.
I am still partial to my iPhone. Tablets will take over, but I also believe they will induce more crime in the future. I know that may sound odd, but people can do more damage with computerized devices that they can conceal.
I believe that a tablet like device will be the pc killer per say. If you youtube the mozilla concept phone, the seabird (I believe it's potentially named), I think that when this is actually possible, that will be the true replacement of the pc for personal use.
As for business world, well there will always be a need for PC's of some sort since there are just too many people working on one server. I don't see that going away anytime in the near future, but cloud computing will take over that within the next 30 or so years.
Tablets are probably the next step in the evolution. They just need to get more processing power and the ability to run real programs.
Computers won't go away, but they will change. I think they will end up turning into a touchscreen TV. All media will be in the cloud, cable tv will be like ham radio, cd's and dvd's won't exist, we'll just have a touch, or even a voice activated monitor asking us what we want to do. I would also like to see an implantable bio computer that runs off of your bodys energy where you could just think about a subject and you would get information either displayed on glasses or something similar.
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