This depends on what third parties do this generation with Nintendo. If companies start generating strong brands on Nintendo, they could benefit from large sales for generations to come.
Sega for example has done very well to integrate Sonic into the Nintendo library. So well, that Sonic has almost become a Nintendo character achieving Nintendo like levels of sales (well, a nintendo B game that is). The first Sonic game on the next Nintendo console is practically guaranteed a million in sales if the game is any good.
On the other hand, most gaming experiences will be tweaked to whatever hardware is selling the most at the time. Third Party developers don't make money from loyalty, but on selling their games on the console that is likely to generate the most sales, so i guess we will have to see what the next generation is going to look like.
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