I actually forgot that Dinosaur King actually is a card game in Japan. But, even still it's not going to be that big. I bet most stores won't even carry the cards.
That's what people said about Chaotic when it first started up. Not that I'm saying that the TCG will be a big hit, but you never know about these things. Besides, risk taking has always been a big philosophy of 4Kids Entertainment. The first show they ever licensed was a series that already had an abysmal reputation worldwide, due to the Porygon seizure incident. And look where it got them.
And as mumbo mentioned, a TCG really isn't a high-risk investment. A toy line would be more daring of them...