Unlike Japan, Nintendo has not invaded the entire home consumer market here in the United States. This leads them to believe there is room for both the DS and the DSi here in the United States. The DS will no doubt be a cheaper alternative to the DSi and the DSi isn’t going to make its way to the US for some time now (well into 2009 we hear).
Right now we’re still working through what the strategy’s going to be here. But we think that there’s huge untapped potential for the DS Lite. Because when you’ve got only one in every five households in the U.S., compared to one in every two in Japan, it says there’s potential.
You’ve seen some of the work we’ve done this year with celebrities, that we’re bringing a lot of new consumers in to the DS. So I think there’s opportunity for both of them to coexist for some period of time. (kotaku)
We all though the DS was taking over the market, apparently it’s going a long way to go. Nintendo probably feels the DSi may take some of the market share for the original hand held so they’re going to keep them both in the market, initially. No doubt, the DSi will eventually out-live the DS over time, but there is no reason to take the DS out of the US market until the market dominance dies off.
Before Sony fans unite to comment storm, remember, the PS2 had a lot of great games and continues to have games coming through for its console. People are still debating the life-span of the Wii product line, regardless to overall sales figures while the PS2 no doubt had a long live and still continues to have a long life, heck 30%+ of gamers still play the darn thing. Sony has been able to utilize the PS2 and its profitability to glide through the initial PS3 sales slump and get the momentum growing for their current generation console.
The Xbox 360 saw a 
It’s official, EA has