I don't know if you're trying to troll or you're just incredibly short-sighted, but I'll bite.
Windows 8 is clearly designed as a hybrid OS, in the same vein that Ubuntu on Android is, even if Microsoft's marketing team don't outright say it. It's fills the use case of "I love my iPad, and I love my Mac, but I really hate that I have these two devices."
Within a year, you're going to see probably about 30% of the new machines being manufactured as tablets, with docking stations. Run the machine in tablet mode, and you get Metro, perfect for reading web pages and flinging Angry Birds around in bed. When it's time to go to work, you pop your tablet into the docking station, and up pops the Desktop for productivity apps. Metro is not going to disappear like Media Center did. It's integral to the whole thing.
The iPad is not a machine to do large amounts of work on, but you'd be surprised how many people are trying to. Have you been on a plane recently? A good half of the iPads I see are actually jammed into some horrible looking keyboard dock. Consumers seem to really want a machine that will do this. That's what Windows 8 is.