People have been saying for 10 years that a user friendly X11 interface is around the corner. I'm still waiting. Also saying Linux in this debate is kinda moot, as all the pretty GUI's in linux, kde, gnome, etc. all work the same on freebsd, solaris, hpux, aix, irix, etc. Will the GUI on linux at some point become user friendly, maybe, will they make the OS itself to install, manage, troubleshoot easy? Not unless the redesign the way the OS functions, and stop having people have to build their own kernels, but ofcourse that stuff is what alot of the Linux users love, they love to get under the hood, and will be pissed if that goes away to make it more user friendly. UNIX(Linux included) using X11 had their chance to make it in the desktop world, and they all repeatedly failed. They make great server OS's, and great specialty workstations, but the won't be a common desktop. KDE/Gnome is just the latest in a long line of "standards" that will unify the unix community to create a user friendly OS. CDE claimed the same thing, had a ton of money thrown at it, was adopted by most commerical unix vendors, and it failed, miserably.
UNIX is simple and coherent, but it takes a true genius (or a programmer at any rate) to understand and appreciate its simplicity -- Dennis Ritchie