Has it not occured to you though that Metro apps are for tablet users and people who want metro.... And the desktop is there for people who don't want to use a Metro app?
There is no point speculating what will happen in Windows 9 or Windows 10 and whether Metro will take over the world, because that's not here yet, but instead focus on Windows 8.
It may be easier to think of the start screen as seperate to the Metro apps, because in some ways that is what it is. The start screen is used to launch both metro apps and standard Windows apps depending on what they are, and your settings. It is possible people who don't like metro apps are then automatically not liking the start screen.
Think of the metro apps as an option, yet the start screen as a requirement, if you get your head round the start screen, you aren't forced to use metro apps.
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