It'll probably reach it, but I don't think it will get 50% lifetime. Price cuts to the PS3/360 will sparks sales tremendously, especially for Sony's system. They just need to drop it to a price point that is acceptable to the masses and not the technophiles and hardcores. It'll probably end up with around 40-45%, I think.
Hi there.
http://vgsales.wikia.com/wiki/Video_Game_Sales - A wiki for video game sales figures







