if the story is true AND targeting such a vehicle should prove as easy as you say... then maybe it's more of a political angle then a simple file sharing problem. I mean, if you disliked the president and you wanted to pursue more of the Bush administration (use of anti-terror to attack the Constitution and Bill of Rights, start new wars etc.) policies, then a perceived attack by terrorists on the President would accomplish both.

Why not approach hardware manufacturers with an ext2 driver for Macs and Windows and educate them as to the benefits of using a non-Windows file system. If the drivers are written by the Linux community and provided to the hardware makers, why would they say no?