A lot of university systems in other places of the world do not have tenure. At least where I study, positions last two years and are renewed in contests where

A lot of university systems in other places of the world do not have tenure. At least where I study, positions last two years and are renewed in contests where candidates are evaluated on academic, educational, and professional qualifications, and an "order of merit" is created, whereby the first in the order gets the position. There's a mandatory retirement age at 65, after which a few exceptional professors might still teach under special temporary assignments. It's not perfect in any way, but at least there's a set of fairly objective criteria, and the candidates are judges by people outside of the institution (usually esteemed professors from foreign universities), and it does put some pressure into academics for keeping up with their research and teaching. The downside is that some very senior professor's merits are already so great that it's almost impossible that they lose in a contest, which is in a way similar to tenure or great seniority in other public sectors.