I think any developer that makes a game that utilises the top touch screen would be extremely foolish as you would be reducing your userbase from like 100million to 5million. Anyway I think nintendo has already said the top touch screen won't be used for catridge games. So the sales of lite, phat and i should definitely be lumped together. Seperating dsi because of downloadable games that can't be played on the other versions would almost be as silly as separating 360 arcade sales from sales of the other versions because it doesn't have hard drive space for xbox live games.
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