I'm really not worried ...
People forget that the DS did not sell particularly well initially, and it wasn't until the first hardware revision and the release of several important games that its sales really started to explode. Outside of a "coolness factor" to own one early, there really is no point to owning one yet and that will likely change when some more games come out.
Beyond that, I do think there are probably some people who are waiting for details about the NGP prior to buying a 3DS; and in many cases I think they are holding off on a delusional belief that the NGP will be cost competitive with the 3DS. If you look at how exchange rates have changed around 2/3 to 3/4 of the price increase of the 3DS (relative to the DS) could be explaned by echange rate changes; and the other 1/4 to 1/3 might be a buffer protecting against exchange rate changes in the future. In a couple months I expect that the same people who piss and moan about the 3DS being $250 will be the same people who are claiming that $400 (or more) is justified for the NGP; but the vast majority of people holding out to see what was offered by the NGP will discount it as a purchase at that point.
