I believe that term limits are a good thing. To me, it is dangerous to have any one person be in any one position of power, for too long.
The term limits are a check against someone keeping the power indefinitely.
Even if the ignorant masses believe that the politician is doing a great job, it does not mean he is. A range of individuals from both ends of the spectrum helps to even out the politics.
I also believe that, over time, after one gains such power it clouds their integrity. They begin to think they are god or something. (I you need some examples look up some Illinois politicians...

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The people do decide! They are the ones who elect, either directly, or by representation.
Travis