I meant Nintendo made games on DSi that I couldn't play on my DS. Do you think that's even more of a vile practice, denying people games in the SAME generation because they haven't upgraded their machine?
Also if a DSXL was your first DS you were screwed as well because of no backwards compatibility.
DSXL / Lite owners knew they were losing backwards compatibility going into the sale. Looking through articles (I'm not sure if Kotaku is okay to link here) it appears to me that there was a lot of worldwide press about the Japanese UMD transfer program around launch, including yen to dollar conversion guesstimates... Followed by a lot of "decline to comment"-ing going on. Then poof, no program. I'd call that a broken promise but "consumer advocates" will probably be quick to claim that this was in gamers' best interests. Whatever.
But Vita's selling what it's selling. Wii U is selling what it's selling. It is what it is.
As for DSi games that you couldn't play on your DS, could you be more specific? And I hope you're not going to reply with some DSi downloadable title but I fear that's what you're hinting at.