I think there's good potential for the Wii U with the parent buyers.. Cheaper choice, current parents enjoy the nostalgic throwback to their own gaming childhood, while providing family/child friendly games for the young ones, all while building up the newer generations of Nintendo fans. I also can't overstate how handy off-screen play can be in a busy living/entertainment room
My guess is that a lot of people are just uncomfortable and have some insecurities with Nintendo being the industry leader. Most gamers just want their hobby to be viewed as legitimate. You can see this in the backlash against "kiddy" and "casual" games, or when video games are being compared to other art forms. So as a legitimate form of adult entertainment (or art, perhaps), insecurities come out when a company that excels in making colourful, child oriented games about magical plumbers and elfs and pocket monsters becomes the face of the industry. They'd prefer that a more serious, sophisticated, or "adult" game or company is representing their hobby as a whole.