yeah just to reiterate, people aren't as mindless as they're sometimes made out to be, even if they're a fan of a certain company that doesn't necessarily mean they're going to jump on every new console/game that company makes, lol. They still only have so much money to spend, so many games they want to play, etc.
that being said I'm a Nintendo fan and I waited until games came out to get my Wii U, same for 3DS (which I now own 3 of), same for the PSP PS3 and Vita (I'm also a Sony fan), I usually wait for the price to decrease at least once and for games to come out, I won't be getting a PS4 probably anytime soon thanks to its prices, for instance.
that being said I think "nintendo faithfuls" have plenty of reason to buy the Wii U now, it's got a lot going for it both in terms of what's already out and what's going to be out and in general with its features etc. (even though it's not a "total entertainment system" like the Xbox One and PS4 make themselves out to be, it's definitely more of a focused gaming console with some useful/fun extra features).