As a Linux user myself (actually, a Linux admin), I know quite a few folks that are like that. The mere thought of change sends them into sweats. I'm an odd bird I suppose, because one of the things that I love doing is making disparate operating systems talk to each other. If you look in a toolbox, you don't find 15 flathead screwdrivers and nothing else - instead, there's an array of tools for different tasks. I view the different choices available for operating systems in the same way.
I signed up for the Cr-48 pilot in order to test our existing systems to see if a browser based solution might be a viable option. For the majority of our users, it's a resounding yes! Unfortunately for myself, many of the tools that I use on a daily basis just aren't a possibility on ChromeOS... yet. Technology moves fast, and as more products move from local executables to the SaaS model, more tools will become cloud based making a platform like ChromeOS a very attractive option.
I'm not giving up on the Chromebook yet. I just think that for what I need, it may be a generation or two too early for me to be able to kick my laptop to the curb.