after the n^xth comment: What about all those who can't afford (or don't want to pay for) OSX/KDE/Gnome + Unity spec hardware?
The above kernel/shell/DE packages (or, in the case of OSX, a more integrated approach) is great for those who have the wealth to shell out $$$ on an overpriced intel Mac box or hackintosh a still moderately expensive PC clone box. Also, not all of us have corporate swag accounts. What about those who run older gear simply because they're cheap or poor?
The i386 Linux kernel allows me to use pretty much any intel or intel-clone box manufactured in the last ten years. My main computer is a six-year-old Pentium D (xfce, 2 gb) which I got for free and spent $40 on for minor improvements. My favorite laptop is a nearly ten year old Celeron running lxde w/ 512 mb. A while back a coworker gave me the laptop because she thought it was "broken" (XP bloat, hardware's fine). So what if the ancient laptop is little more than a glorified typewriter and email client? Not all computers need to have gee-whiz desktop enhancements.
Yes, desktop Linux will never fly with the majority of the market, especially because many chipsets do not have kernel support (this has changed _significantly_ over the last few years) and because bash is still required. Still, if you scrounge the bottom of the PC food chain like I do, 32-bit kernel linux is still the only way to fiy.