"You need to understand why your products are selling well so you can plan for the future, right? It defied the conventional thinking," Yoshida recently told Eurogamer. "Lots of people thought the dedicated game hardware might not be needed going forward, but still lots of people are very excited."
The rightful concern Yoshida brings up is that Sony will exhaust the core customer. That the number of consumers interested in playing video games is a finite number that the company will rapidly reach with the new console. The good news for Sony is its initial market research is showing it's obtaining lots of new customers who didn't own a PS3, with some who didn't own any last-gen hardware.