Do you have kids?
It's the perfect present for your kids and fun for the whole family.
Are you a tech enthusiast?
It's a hot new device with a cool-looking screened controller.
Are you a gamer?
It's a new console, thus automatically more interesting than the outdated console systems currently on the market, has many good games (with more "heavy-hitters" to come), new ways to play games, costs about the same as the old systems, ect.
Really, the only reason to ignore the system would be if it simply doesn't have anything to please you or if you don't have the/don't want to spend money on a new system (altho given that the upcomming systems will all likely cost more and that it doesn't cost significantly more than the current systems this may also be questionable for some).
I have a hard time seeing how this system will "flop", especially given the relatively low price and much better support than the Wii got (besides the usual highly popular Nintendo franchises like Mario, Zelda, Smash Bros., Wii Fit, ect.).
Infact it may quite possibly be the best-selling system once again (and please most gamers too, given the above reasons).