I've read many many threads on this topic. Many make little sense to me with the whole Ram and stuff, but my opinion is simple; it has to do with consumerism.
People will buy whats popular and new. It's common knowledge and a vast majority of people, especially kids and teenagers fall under this catagory; people want the newest and greatest things. Either its for bragging rights or if it's overall just better, who knows.
The DSi is better than the DS, there is no denying that. The DSi sold a lot more than the DS did when the DS was released. Almost 3x that. We can't deny that, its facts.
With this being said we can only conclude that the DSi is a popular, wanted system, and we all know what happens when things are popular and wanted; more people want it. Not only that but Nintendo has the power to make DSi huge, and they are dong a good job. Countless threads across the World Wide Web, all about the DSi makes it even more popular, even if people don't read them. If history repeats itself which we all know it does, no nintendo system has had more than one update. and DS to DSi will not break this cycle. For example:
GB -> GBC
GBA -> GBASP
DSP -> DSL
These are updates. There isn't any change in the hardware, but just the look. (With the exception of GB to GBC of course. This is obvious though)
DSi is completely redesigned, a new menu with new features, better hardware (or so we think) the only thing is, it didn't change its name, or the look. Seems to me that the DSi is the one system that screws with past patterns.
I bet Nintendo is loving us all bickering about this, and this is all some grand scheme. These arguements are too early for one, they are hypothesis' for another thing, and honostly there is no wat we will ever know whats actually going on in the heart of Nintendo. It's pointless and laughable.
we have people who are pro Dsi and would fight and argue about it till the sun goes down.
We have people who are pro DSL and would fight and agrue about how its better till the sun rises.
Then we have poeple like me who can't help but to read all the arguements.
But thats my opinion,,,