How many winners?

With so many entrants into the Ansari X Prize competition, one might think that there are going to be 20 suborbital tourism concerns within a few years. How many will there be in twenty years? The answer is likely to be three. Ever heard of the Big Three automakers? For years there were three major TV networks. Three media buyers. Three major telephone long distance carriers.

http://www.thespacereview.com/article/160/1