I applaud the sentiment, but I suspect they'll be back on Windows in a year or two after a flood of user complaints when things are "hamstringing the entire department!!!!" because
Karen in accounting can't get spotify on the machine. I've had hard arguments about local admin privileges for users many times - how are they going to feel about an entirely new operating system and office package?
MS do a wonderful job of making the shift away from Windows/Office *just* annoying enough to prevent people* doing it, whilst not so bad that it's actually preventing them to the extent where they have the kind of dominant position someone can take to court...
*Except mac users. But for them it's often a matter of form-over-function. They want to be an enlightened "mac user", not a windows-using troglodyte like all the other kids. Some have genuine reasons, of course, but a lot of Apple fans just like to be different. Which is also true of a lot of Linux users - albeit in a different way. Using a mac is like driving a Saab used to me. A linux PCs is like using a car you built yourself from a scrapyard. Or so their proponents would like to think.