"System Sellers" generally do not boost hardware sales in the way that many people expect ... As soon as a game is announced and until a system is discontinued a game will factor into people deciding to buy a system. Outside of the initial boost there generally isn't a change in the level of how a system is selling because of a game being released over the long term.
There are exceptions ... A game with no real following can be released to a system and attract the attention of people who never considered buying the system before. The best examples of games like this would be Nintendogs or Brain Training for the Nintendo DS.







