conventional wisdom

高性能が売りのゲーム機「X-box360」や「プレイステーション」シリーズの売上げが伸びず、逆に性能面を抑えた「ニンテンドーＤＣ」の売上げが伸びている、という内容の記事からの抜粋。


Such a phenomenon contradicts the game industry's conventional wisdom, which holds that exellent computer performance is the key to grabbing a bigger market share.

(the) conventional wisdom = the view or belief that most people hold
= a belief or opinion that most people have
= the opinion that most people consider to be normal or right

昔から正しいとされている通念、常識


例文：
○ The conventional wisdom is that boys mature more slowly than girls.
○ Conventional wisdom says that gang members must be reached early to change.


冒頭の Such a phenomenon というのは下記を指しています。

Sales of high-performance products, such as Microsoft Cort.'s Xbox 360 and Sony Computer Entertainment Inc.'s PlayStation series, have hit the wall. On the other hand, NintendoDS by Nintendo Co., which cannot match the others in performance is selling well on the coattalis of its hit software.


この記事では、「高性能化こそが市場を拡大する」というこれまでのゲーム機の常識が転換点にあるのではないか、ということを指摘しています。