It's really sad to see people holding out for the same titles that defined the last two generations. There are already great original titles for the Wii U - ZombiU and Wonderful101 immediately come to mind. Plus, for me personally, the backwards compatibility is a godsend for those of us who skipped the original Wii.
A small library of original but great titles. Established franchise entries like DK Tropical Freeze, NSMBU, and Mario Kart 8. A fantastic lineup coming down the pipe. Virtual console to scratch that retro itch. Backwards compatibility to hundreds of Wii titles. If the above isn't enough reason to grab a Wii U, one game isn't going to make a difference. Smash Bros isn't *that* good of a game to sell a system by itself.