First, you really don't want "term limits". We already have term limits; two years for Congressmen, 6 years for Senators. If you dont' like your Senator, elect someone else.
FYI: look at what has taken place re; the President for the past 4 years. GWB, whether you agree completely with his policies or not, has not had to answer to any polls for the past 4 years. Trust me on this one; you do NOT want "term limits" extended to our Congressmen and Senators.
And to hope to "depend" on your Congressman is a defeatist attitude to begin with. Rather, you should watch his every move and hold his feet to the fire.
I said don't bet on it happening.