I'm not at all convinced Zelda can anchor a park. The series is beloved among gamers of course (and if my icon doesn't make it obvious, I love it too), but it does not carry near as much wide appeal among the general public. The series has never broke more than 10m copies (although I'll be fair that that may not be accurate, as game sales are hard to track) and simply isn't a household name like Mario, or even Pokemon. IMO if they add Zelda, it'll be a smaller, supplementary land similar to Springfield.