Is the theme of a CCG important?

forgive my broken english first.
Recently world of warcraft TCG was down,though the tragedy didnt came from its tightly connection with the declining market of world of warcraft, it still led me a question of the importance of the theme of a CCG.
unlike most of the game we can find in the store, MTG has solved this theme problem by its tricky planeswalkers' shameless travel around all over the universe. MTG is no longer fixed to any theme years ago.
But Pokemon?there is no planeswalkers in pokemon and I dont see any chance for those kids jumping to another world with their pokemon. If the story of pokemon has an end someday, what will the game be then?
Game of Throne? We all know that this story must has an end since Martin cannot write another 20years. what will the game be when all the conflict and conspiracy put to an end?
In my country, which is China, there is even some CCG based on some real-happened history. And the game is unbelievablly realistic! I cannot trust myself this game will survive for 1year after all the characters have printed since some had already be printed three times......
I want to discuss this with all you guys. Is the theme of a CCG that important?
Recently world of warcraft TCG was down,though the tragedy didnt came from its tightly connection with the declining market of world of warcraft, it still led me a question of the importance of the theme of a CCG.
unlike most of the game we can find in the store, MTG has solved this theme problem by its tricky planeswalkers' shameless travel around all over the universe. MTG is no longer fixed to any theme years ago.
But Pokemon?there is no planeswalkers in pokemon and I dont see any chance for those kids jumping to another world with their pokemon. If the story of pokemon has an end someday, what will the game be then?
Game of Throne? We all know that this story must has an end since Martin cannot write another 20years. what will the game be when all the conflict and conspiracy put to an end?
In my country, which is China, there is even some CCG based on some real-happened history. And the game is unbelievablly realistic! I cannot trust myself this game will survive for 1year after all the characters have printed since some had already be printed three times......
I want to discuss this with all you guys. Is the theme of a CCG that important?