I am going to step in the hot water here, but if the people continue to elect them, then I think they should be able to run again. If the people are unaware enough to continue to vote for people that are not serving their interest, then that is the risk we take in a democracy. Furthermore, I don't think the Presidency should be term-limited, once again if the people vote to elect the person then that is the action to override the term limit. You want a democracy, take with it the risks and allow the people to decide.