I didn't see any games for launch that used the new abilities to the point of justification of the touch screen. I wasn't impressed by anything other than the Metroid demo, and mostly because of the control. But my point is, I didn't buy one because I knew there was nothing the thing was doing yet that I can't already do in analog on many other systems, including my N64. I already own SM64, why do I need a batery operated version without analog control? Obviously the system's launch is aimed at two crowds. Obsessive fanboys who have to own perhaps just to collect the Mario 64 x 4 or for the multiplayer and powerups that should have been in the original version. And the people who never owned the N64 or maybe even a GameBoy, so they're up for a brand new handheld right now. Those are the majority of the people who have gobbled up the DS. It can only sell so well so soon after the GBA because the hardcore market is very hungry. Nintendo can launch a system early and rely upon Nintendo fans to eat it up while everyone else stays with what they have. Then once a lot of games are out for it, like a Castlevania that uses the touchscreen, then the rest of the world will start looking at the system.
I see no purpose in buying a system based on the features if the features are hardly used. If you buy it knowing this, then don't complain to anyone else in my opinion. It was smart of Nintendo to sell the sytem's many features. It doesn't matter that they aren't used much, what matters is that they are built in and cheap, and they will be used one day. Nintendo and Sega have been working on voice recognition for years. Both the N64 and Dreamcast had games that used the feature. Sega was talking about being interested in the voice recogintion technologies that Nintendo was working on back when they were just going third party, back before we knew anything about Mario Party 6, DS, or Revolution. Sega has been developing technologies that animate characters' faces with emotion by reading the tone of our voices. SquareEnix is going to be making online games for the DS soon maybe. And I'm sure the touch screen will get used plenty in sports games, FPSs, RTSs, and RPGs. There are many games like fighting, racing, and platforming that just don't require a touch screen though.