I, for one, am not getting my hopes up. What are the odds that they'll actually make one? I couldnt resist taking the survey, though.
I was torn between Zelda Golden Sun. I easily discounted F-Zero (what, you throw cards and see who's goes farthest? Gimme a break), Mario (too character driven, not quite open-ended enuf), ADV Wars (it's basically a board game already, just more managable), and Fire Emblem (see ADV Wars).
Zelda seems like a good idea; it is a vast world to explore, many races/species to explore, and it has its own culture. You can feel a Zelda setting. It has an aura that makes the Zelda universe unique. Zelda fans can probably understand this babble better than a non fan. Think how Tolkein built a world that is truely unique, believable, and explorable. Think Star Wars/Trek. Same type thing.
Now, while Golden Sun is younger than Zelda, i think it has the same promise, but more so. It can avoid being character driven so that you are free to do whatever you want and play the game (think Magic vs. Character-Focused DBZ) There are plenty of fantastic creatures, the geography is awe inspiring, there are ways to mutate properties, via Djinn, items, etc., and there is a world that can be discovered without being tied to the game. That is why i voted for Golden Sun. It has potential. You can modify stuff with Djinn, items, you name it. There are unique environments to make a color wheel/pie kind of thing (think Magic colors' importance to the game): there are desserts, oceans, grasslands, forests, mountains, snow fields, caves, and more. This could be the foundation that the game can be built on. Zelda has just a few noteable races; plenty of unique characters to each race, so there would be a flavor-oozing game, but not much of a function to it. Golden Sun can fight the monotony of YGO--it can have colors define one card from the others, it can have multiple identical cards on the field without feeling like you have an army of unique characters. That's why PokéTCG works: there are more than just one Pikachu, so thats why it doesnt feel weird having four out at the same time. Golden Sun can be made a TCG pretty easily
How well is left up to them, though.