With more options available, the number of Prius buyers naturally goes down. This is especially true when they do the research on what people are actually getting re: MPG. When I opted to buy my HCH2 I checked out the Prius and was very interested, but not for overpriced packages and a 4-6 month wait time (though I would have loved the more flexible space and hi-tech toys). The HCH2 was more readily available , was a better looking car IMO, and was getting close to the same MPG. Prius sales will probably continue to dip once the TCH begins selling like hotcakes. (Unless hybrid buyers will continue to be motivated by maximizing MPG.)