his reasoning make no sense whatsoever, in entire history of Nintendo neither publisher was important to their success and or survival, the most successful 3rd party publisher on any Nintendo platform was Ubisoft with Just Dance.
the others not so much, for example Fifa on Wii not even in Top100, on GCN not even in Top100 on N64 with pathetic 600k sitting near the bottom of Top100
their support is barely important for Nintendo
And even IF WiiU became success in the end there is hardly any market for them.