The week of release doesn't matter ...
Games like Nintendogs, Brain Training, and Wii Fit had an unusually large impact on the sales of Nintendo's hardware by reaching out to unconventional demographics that didn't currently buy a lot of gaming systems. While these games probably sold far more systems than most platforms killer apps combined, the sales happend over months as new people were exposed to these games and bought systems for themselves.
The best measure for whether a game is a killer app is its total game sales because there is a portion of any game's userbase that bought the system for that game; and this will likely fall in the 5% to 20% range for most games. When you start dealing with games that sold tens of millions of copies of games for a system it is likely that they were directly responsible for the sales of millions of pieces of hardware for that system, and would clearly be a killer app.
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