I don't know about other folks who use the Nintendo DSi, but I have made a bit of an investment in downloaded software. I certainly enjoy the freedom of being able to add new software to my DSi and have it available 24/7 without having to bring extra game cartridges with me. It never occured to me that, unlike the game cartridges I purchased, I wouldn't be able to take these downloaded purchases with me to any new game system I bought.
And yet, that's just what Nintendo, the erstwhile champion of downward compatibility has done. They've put a big, huge roadblock in the way of fans who might otherwise like to move up to the Nintendo DSXL or the soon to be released Nintendo 3DS.
Will this be the Achilles heel of Nintendo?
DSiWare Will Not Be Transferable Unless Nintendo Makes Changes - Nintendo LifeLabels: Nintendo DSi