When it comes to video game IP's, I think it has to depend on a few factors of if it could work for a theme park.
To list two examples,
1.) The General Public - This is something that I would think is crucial. One of the reasons why SNW will work, is that a good few of the characters are very well easy to know. Now, will that be the case with every video game IP? Maybe not. There has to be some form of a larger awareness, because if not; it could go niche real quick.
2.) Will it be Timeless - To me, this I find more important than GP. If a IP or concept can last longer than one particular field, this may be a great thing. I think it's even more crucial when it comes to games.
Games can have the potential to either be easy to think of, or complex enough to have trouble. I think it's very important if Universal Creative/Comcast desires to bring more video game IP's to the park, is if they will be able to keep pushing the IP for more than 5 to 8 years. It's stuff like Transformers, Simpsons, Jurassic Park/World, and Harry Potter where people will know what is what by the characters, locations, and worlds being created.
If an IP like Ni No Kuni happens, you have to be delicate and careful on what you try to do; as it won't be a series that everyone will know off the bat.