Similar to what happened when the PS3 came out the DS still has an enormous market. I can imagine that the system will continue to sell well after Nintendo has release the 3DS. They have been thinking about trying to localize some of the games that never made it out here for one reason or another as a way to keep the system going. Iwata said this when speaking with investors and thinks that it would be a great way to take advantage of the DS’s large library.
I am a huge fan of the DS and would be absolutely thrilled if say 7th Dragon ever made it over here. So I am very excited about the idea of continuing to localize these game. This could also mean good things for any Fire Emblem fans who want the DS remake to come out here as well.