Thanks for the ping, good article.
Linux has somewhere between 15-24% of the world market (depends who you talk to) thats a pretty good foothold. If you want to talk plainly about why it wont penetrate the desktop more you need to look at 15 years of code written by companies to run on one operating system. Heck I could get linux desktops deployed with little to no resistance from upper management and users if only we did not have so much dang powerbuilder code floating around..
I think the future is now, with OSS and closed source in the same echosystem. Sun uses Samba, SCO uses webmin, VMWare uses a linux kernel for the console, and all these companies save money to focus on their business focus...