It seems to me as if Microsoft is too focused on Apple when the real danger is Android. There are some pretty good Android tablets right now that could easily be mated to a keyboard. There are Android apps providing decent office automation in the $0 to $15 range and there are already half a million Android apps ready to go.
Google has an arguably better ecosystem than either Apple or Microsoft, with Google Play, gMail, Google+, Youtube, Google Drive and the Android OS on half the cell phones in use today. They keep winning converts.
Android is prime for this contest and I'm not sure that for many if not most home users the Android manufacturers have the advantage. Microsoft will be hard pressed to beat Android back.