[bocklund]

I don’t have data, but I think most tenure track professors get tenure (if not at their current university, than another).

Adjunct professors are not tenure track, so there is really no expectation that they would get tenure. Though I have seen the numbers that say the number of adjuncts is increasing.

[vonmoltke]

The point is that far fewer professors are tenure track to begin with, compared to past decades.

[olliej]

Almost every lecturer my wife has is tenure track or already tenured.

One of them just plays videos of himself in his lectures. He doesn't actually go to them. He is actually around during less than half of his scheduled office hours. He complains to (and at least once has shouted at) the TAs about how students keep asking him questions. He has tenure.