Wii or DS don't sell more because of their "games library". Casual gamers who buy them don't even know what games are on the console. They know "people buy Wii", mostly because of small motion control party games, and DS has pokemon and casual games. That's all.
But for us core gamers, the great games are still on PS3 or on 360, and the handheld to have is the PSP (MGS 5, LBP, Monster Hunter, Valkyria, GTA...). The Wii is still not so appealing, with the exception of Mario and Zelda games.
DS and Wii simply don't have enough technical abilities to bring great games on it anyway.
This is a ridiculous notion. The consumer is not stupid, and te consumer is not uneducated about their buying decisions; pretending that they are either of these thigns is jsut flimsy justification for the idea that the general consumers has value sets that deviate from your own.
The Wii and DS sell on the strength of their libraries, period.
This last statement exemplifies why your value set deviates so far from the norm that you're unable to understand what's appealing about these libraries.