the ds won't last long after the release of the successor,
i mean you can even feel the change of generations already.
the number of announced or released games is shrinking, and the number of titles which are at least of medium quality isn't really big, because all developers are already preparing for the development of upcoming games for the 3ds. the only big deals which are going to be released in local areas are of course pokemon black/ white and okamiden. thats it.