If the Wii had one strength it was family appeal. Wii Sports, Wii Fit & Mario Kart were the key titles convincing parents this worthwhile purchase. Safe, fun, cheep, these may not be the key motivation for the kind of people on chat on a Wii U messageboard, but families were the target demographics of the Wii.
What worries me more than 3rd party developers and mind blowing graphics is if the Nexbox or PS4 capture the family market...then Nintendo's got problems.
The Famicom was a portmanteau of Family Computer for a reason.