McDonalds and Coca Cola are living proof that you can spend millions of $$ and try to artificially create an epidemic but fail. In fact, things generally 'Tip' because of word of mouth. That's how Google did it. Once you get certain 'key' people to get on board it starts to manifest and grow. But it does not start with a super bowl commercial.
I correspond with lots of people around the world every day and I joyfully scour the internet for press releases and inside CAD information. I am starting to see more and more commitments like "We plan to be 90% REVIT by 2009".