The significance of the $100 difference is definitely overstated. The reason the Playstation 3 faltered at the beginning of the last generation was due to the fact that it was A) Out priced by the competition B) Had its release date undercut by the competition AND C) Had a worse game lineup than the competition, all on top of the fact that their marketing was horse shit in comparison to the competition. It wasn't price point alone. Only A is true for the Xbox One, at least within markets it actually has a chance at being competitive within.
Price definitely has meaning when it's substantial, for example, off brand televisions at Walmart vs. Sony, Samsung, etc. televisions where the difference is anywhere from a few hundred to thousands between similar sized televisions. But the difference in price here is minuscule in comparison. Consumers are willing to pay a premium when purchasing the iPad, instead of settling for cheaper alternatives. People are willing to drop major dollars on iPhones, Galaxy's and other expensive phones instead of settling for cheaper alternatives. People are willing to drop big bucks on these types of consumer electronics; and marketing, games, secondary uses and regional taste/preferences are ultimately going to be more of a factor than price and graphics when it comes to ordinary consumers deciding between the Playstation 4 and XB1.