DS Games Selling Badly: Or Why Install Base isn't the End All Be All

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Well the point of OP is faulty like others have point out BUT
on the question about support to the various platforms I think he have a point althought not entirely sound.
What I mean is that Wii is NOT a PS2 ( it isn't mean to be ). So a huge install base doesn't traslate to a huge third-party support "stolen" to competition like previous generation.

The point is that this a uncommon generation where a contender ( Nintendo ) is succeding to change the context of the market ( paradigm shift ).
Develoers and publishers ( and products ) that don't suite to the new set of values brought by Nintendo will never be a good suit for DS or Wii.
The cardinal point of Disruption however is that the disruptor has a better ( more profitable ) business model thanks to the inclusion of new value at low cost ( remember key word here is "good enough" ) and the exclusion of costly values that have surpassed the desiderable curve for most consumers.

In this landscape the huge success of Wii will likely brought a damage NOT to PS3 or 360 but to their old way to conceive the market ( the previous status quo ).
Publishers early or later should adapt.
"Innovate or die".