Mainly since Chaotic is an online virtual card deck. And 4Kids can bungle any property that could easily make money (still upset at them for the lack of Kirby toys, and nothing coming out of a plan to make products based on the early works of Jim henson).
That said, Japanese shows pretty much do have a built in toyetic ness to them. Some shows feature hundreds of characters that would be great for individual minifigures... Like Anpanman, or Pokemon. Some are just so cute, and they sell to little kids and teenage girls, Like Doraemon. Some shows are action based... goes without explaination. And whatever's left always finds a place as a Plushie, minifigurine, candy figure product or anything else you can care to imagine.
I say that any cartoon has potential for toyetic-ic-icity(?) It depends on how much the merchandisers want to make them. I pretty much buy anything I like, and even some occasional things I don't care too much for, but like seeing in toy form.