We have always had term limits, it’s called voting. If we do not like what a representative is doing give a term limit by voting him out.
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 problem is that you can’t vote out someone else’s elected representative. They are happy with the corruption if it benefits them. The only answer is term limits.