It's actually already happening, just very slowly. Users are refusing
to take up Vista, shops forced to re-intsall XP on new computers,
countries and US states are taking them to legal courts, people turning
to alternatives, etc.

Microsoft has been dubious quality and had dodgey business practices
from the beginning, and now more and more people are finally waking up
to that fact.

Here's even more evidence from todays news stories on Slashdot.org ...

   Microsoft Brand In Sharp Decline
   --------------------------------
   A recent poll of about 12,000 US business decision-makers
   by market researcher CoreBrand found that Microsoft's
   brand power has taken a dive over the past four years.
   According to the study, Microsoft dropped from number 12
   in the ranking of the most powerful US company brands in
   2004 to number 59 last year. In 1996, the company ranked
   number 1 in brand power among 1,200 top companies in
   about 50 industries. The CEO of CoreBrand said: 'When you
   see something decline with increasing velocity, it's a
   concern.' To add some historical context, IBM suffered a
   much faster and more severe decline in brand power in the
   early 1990s and it took them 10 years to rebuild the
   brand's reputation.

www.itworld.com/Tech/2421/microsoft-brand-in-decline-080328/index.html