Success and failure means something different for each of the companies ...
Nintendo's biggest consern is making profit, being able to remain a hardware manufacturer, and being able to make the games they want to make; sales factor into all of these things because if they fell below 10 Million console sales after 5 years they would likely fail on all three points.
Sony and Microsoft are less open on there goals, but many of the assumed goals that people state would require a very large userbase ...







