In 1951, the 22nd amendment was added to the Constitution, putting term limits on the Presidency. Since then, there has been some debate about adding term limits for Congress. Personally, I don't get involved in the debate, since I find it a distraction from the real problem of state power.
However, I have a question for opponents of term limits: do you also oppose the 22nd amendment? I don't see how one could consistently oppose term limits without opposing Amendment 22.