I read Ambitious Brew, and enjoyed the heck out of it. Hell, I follow the author's Twitter feed. You have to keep in mind, that for the majority of the beer-buying population, that statement is probably fairly true.
While craft beer is a fairly large and popular market compared to what it once was, on the scale of the total amount of beer brewed and consumed in the US and Canada, craft beer is just a drop in the bucket.
Per the
Brewers Association, 2008 US Beer sales were about 210 million barrels. Craft brewers accounted for about 8.5 million of those, or roughly 4 percent.
Sobering thought, huh?