Tablets with Windows 8 might be ready to replace laptops when Intel processors are less power hungry and run at lower temperatures by then -- a lot of programs can't be run on ARM processors. Android and iOS are just too limiting. You must remember that for a laptop you can fit a lot of components under the keyboard --- on a tablet you have to stick everything into the back of the screen.
For a fully functional laptop replacement you need a full set of expansion ports, mouse support, full Windows programs compatibility, etc. We will get there some day.
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