Can be a good idea in some incidences but a very bad move in others. I predict the voters will be voting it down in the next 15-20 years.
It all depends on which politician is being forced out of office. Ronald Reagan could have easily won a third term, but then, so could have Bill Clinton.
It is never a good idea for someone to have a guaranteed job for life. Even Republican stalwarts such as Orrin Hatch and Alan Simpson got wishy-washy in their old age.
In the good old days no self-respecting politician wanted to spend more than two terms in office: they either moved up or moved out.