What's with all this KDE shit? We all know GNOME is the real package to go with. Only losers use KDE.
Yes, I'm kidding, but now you know exactly why we don't have Linux on the desktop. Linux Ignorance sat around for the better part of a fucking decade bitching back and forth over which desktop package to go with.
Desktop schmesktop. I want to use an application, not stare at some fscking icons, menus or panels all day. Fluxbox with no panel and a dozen virtual screens gives me just that. I basically have one v-screen for each task, for 100% focus. Out of sight, out of mind. The point of a computer is that it can handle much more information than me -- I'd just get lost in all that, instead I'll just do one thing at a time, and do it well.
Of course, that's just, like, my opinion, man. If someone wants to recreate the Windows experience on Linux, by all means, just do it. That's the whole idea of open source, use your computer the way you want. (Why "PC" means "Windows" in common parlance is beyond me -- Linux and other open OSes make computers much more personal.)
As for binary compatibility, just by assuming x86-64 (or just x86?) you're breaking a whole lot of opensource/unix tradition. The portable way of installing software involves
Linux on the desktop won't have much hope unless people get the whole idea of open source. With the typical binary distro, it's not much better than Windows or OS X. The kernel won't matter that much when the user experience is crippled to that Fisher-Price level where you're allowed to do these certain things, and not be the master of your own machine.