An opinion piece from Steven J. Vaughan-Nichols. SJVN makes a point with real numbers, dollars and cents type, for Linux gaining a foothold the the business market.
I think the biggest problem for the Linux PC vendors if this happens, will be keeping up with the demand. Dell and HP may come back into play, if they will do something about the prices. Case in point, Dell selling the Linux loaded PC for more than the same Windows loaded PC in the UK, and then Dell pulling the Linux offering, because it wasn't selling. I would buy the one with Windows, and wipe the drive, loading my own Linux, if I had to pay more for the Linux one up front.