[Xylakant]

I think you'r missing out on another large group of users: Those in a large organization that need a defined set of features, often provided by a custom application under control of the given organization. Those users have well-defined requirements and do have an IT department backing them. Pretty much all of the administration falls into that category: They're not supposed to go wandering off changing config settings or downloading and installing software. They have a handfull of programs that they need, nowadays often server-based, and if those programs can be made to run on linux, they couldn't care less about the underlying OS.