I always find fixed that or fixed this arguments quite strange especially when they are usually advanced by the sort of 'libertarian' people who baulk at any sort of legislation in any other area.
Take the opportunist attempt to impose a two term limit on Ken Livingstone by the Lib Dems and Tories in the unelected House of Lords, simply it seems, because they cannot beat him at the ballot box!
Just imagine if the two term limit had not been in place in the US, we might have had a third term Clinton administration and no Iraq war or George 'Dubya' Bush! I do not see the logic in ideas that restrict the electorate's choice. It seems to stem from the worst type of John Stuart Mill brand of liberalism [4th paragraph] that fails to trust the electorate at all - thinking them too ill educated to make a decision about when a change is needed.