No XP, it will just be the end of illegally free copies of Windows on file-sharing nets. Actually, even that's doubtful. I say 3-4 weeks after it's put on shelves until a crack for longhorn is released. I really don't think longhorn will have as big of an audience either. If i'm not mistaken, it's switching to an entirely new filesystem, and they'll probably link it to MS servers so they can shut you down at a whim. (They can do that now, can't they?) And they'll end up packaging it with a 1-year licence (that everyone will click yes to) and charge...$250 a year...oh, sorry, a low introductory rate of 19.95 per month for it's use. Remember XP, longhorn is the (possible but very unlikely) end of -=illegally=- free software.
Key word (and phrase) of the evening for XP user: illegal, monopolistic practices