I'm going to go further, it's not about the OS or the Application. It's about the formats. If you're using open standarts you can change OSes and programs at your will, and not have your files held hostage by some software company.
But it will soon be universal to use open standarts on everything. Hell even the music and ebook industries are killing the drm right now.

You can thank the "religious nerds" for your new freedom then. Until then, "just use your tools", but try not get too much in bed with proprietary stuff or you'll wake up to disaster one day.