Obviously, and if I don't like Windows, I can install a BSD or anything from http://gnu.org/ and run a fully free computer (or Kolibri or Haiku). That is relevant to the success of the open-source movement on the desktop, but it's not the end-game.
that's a bogus comparison: if you replace windows with BSD you aren't running windows anymore. if you replace google's maps app with one from openstreetmaps you are still running android.
