I would still argue that term limits mandated by law are necessary, because of unscrupulous politicians who stay in office by sheer demagoguery, and by bribing voters with money from the public treasury. They won’t leave, and say or do anything to stay.
As human lifespans increase, we could have people sitting in Congress for a century or more.
The fact is this:
When the framers wrote the laws, they never envisioned a fed/state/loc bureaucracy
you just summed up Ted Kennedy’s career