Linux is my desktop of choice when executing work for my clients — I have more powerful tools that are easier to obtain and maintain and are of equal or greater quality with lower licensing restrictions than their non-free counterparts. R, MySql, Python, Ruby, Apache, and the general ability of Linux to support older hardware makes my work life extremely pleasant. The available GUI layers (Gnome or Cinnamon) have come a long way over the last decade, while the big players have done little to make things better in terms of the end user interface.
I am hopeful that while the *current* F500 or F1000 may never switch to Linux on the desktop, my favorite clients — small to medium sized firms — will gladly do so, and realize the benefits thereof. And some of those firms will get bigger. Much bigger.