Earlier quoted context omitted.
Considering that pokemon is also a card game... :)
Even when the cards themselves were popular it was as a collectible supporting the video game and TV show, not as a primary interest. That their popularity derives entirely from recent innovations implies their conservatism is not what makes them successful.
Specifically stated, there is money they would not have been able to make, had they not also printed some playing cards. Do you think it would have made sense to just abandon that money?