Should they change the story?

This series will surely generate a lot of hype in the beginning,but,in the long period,considering it has to last 7 seasons,it could become boring,because everyone already knows the plot,as both the books and the movies were very succesful. So,should they write a different version of the story,altough still with the same characters and the same general premise,to make people keep talking about the show trough the years? I think it would be a good decision.