If you asked a focus group to pick Pokémon, Zelda, or Mario, Mario would be the winner. Willing to bet more people have played a Mario game in one form or another, versus the other two, as well.
All three are great franchises, and can work in a park setting, but Mario is most marketable. I’d rather see Mario come to USF than a new park, but it’s understandable why it would be held back for the next park.
I don’t think Pokémon and Zelda ever had a fair shot at happening before Mario. That was a rumor that people took and ran with. Universal has more franchises than they know what to do with now (Illumination: Sing show at USJ, SLoP at USH, plus all the Dreamworks Animation franchises), so I can’t imagine them prioritizing Nintendo’s other IP first.
That said, KidZone refuses to die. Here’s hoping that Sesame Street at SWO lights a fire under Creative’s butts to change it for the better.