I frankly don't think the majority of Mac users are these crazy super techie types - they're just the most visible kind (bloggers, techno-artists, etc.). Linux is still far, far from a replacement for most Mac users in terms of the user experience and most people aren't going to care about these open standard arguments until it's too late (i.e. they want to move to a new program and find they can't take their hard-entered data with them).
Still it's interesting to watch these people who clearly do "real work" moving over to Linux. I've always had the distinct impression that Linux is good for 2 things - 1, being a server (of some type - these days that could mean a media server) and 2, being a tinker box. Most of the people I have ever known who "use" Linux either run and administer servers on it *or* they don't do much "real work" on it and they just tinker with it, spending most of their time actually playing with the OS itself. That's not to say that Linux can't do real work, but it's hard to deny that for most people who are producers - people making the content we enjoy daily (film, TV, digital art, etc.) - Linux is just not as functional and enabling as Windows *or* OSX. So yes it's interesting to see these people moving over to Linux to do "real work".