FYI, you aren't the first little bo peep to make that prediction, I've been hearing it myself since the 90's, when lots of people lost lots of money on VA Linux. You need to confer with some real experts, there's no one predicting any significant increase for linux on the desktop, anytime soon. If you want something different than MS on the desktop, place your money on Apple, although I won't be placing mine there anytime soon. But at least they have a product that's cracked the door of Best Buy, although I don't think Circuit City lets them in at all, at least not right now.
Believe what you want, even Apple has lowered their prices comparable to the PC. They had a great run while it lasted. Longhorn will probably doom them.