Nintendo has become self-sufficient, much like it was in the 80s and early 90s. True, it has a lot more competition now, but it also has proven it can utilize that compeition to improvize and create new markets. As well as generating the majority of their profits through their own means.
I don't think the question should be so much about 'who will kill Nintendo'. It should be more of a question of 'who can beat Nintendo at their own game'. Hence why Nintendo now considers Apple their competition, because they are using a similar model of self-sufficient business. No matter how you feel about Sony (or Microsoft), they have always relied heavily on third party royalties and making back profit after a heavy investment.
Six upcoming games you should look into:
