In the book Winston believes that one day, even if its not in his lifetime, the people of Oceania will rebel and overthrow the government. But when he goes against the Party by having an affair he gets caught and "cured". Even Julia believed that there was no possible way an organization of rebels could ever exist. Although, if the inner party politicians die and get replaced by new people will those people start to get rid the old polices and create a new government? After all, those new people would probably have to be taught the real history and they may suddenly decide to change the government back to the way it was.