Since Wii U failed, what should Nintendo have done to follow up the Wii's success?

[umegames]

The fact that I like my wii-u 10x more than i did the wii, including said titles like mk6 vs mk8, brawl vs smash 4, dk tropical freeze vs dkcr and even nsmb vs nsmb wii-u, the wii-u has been better to me, that's all that matters.
You ask about the successor to wii-u, well i could care less if Nintendos next systems outsells the Wii, if the titles suck, its a fail.