Duh. Zelda is a franchise that people will buy a system for. The Wii U doesn't have an original Zelda title, so there are still probably big Zelda fans who don't own the console. So of course it will help.
As for how much, it depends. If Nintendo really goes all out, and makes a game that uses the hardware features and presumably stronger graphics, then it could be huge. If not, it will still be failry big.







