Tenure matters if you happen to be teaching English literature and have a bunch of people who want you fired because you have the temerity to point out that Chaucer's characters have the symptoms of syphilis.
Tenure matters if you happen to be teaching biology and have a bunch of people who want you fired because you had the temerity to teach about DNA and evolution.
Shall I continue?
Yes, there is enough oversupply of PhDs that Texas will still fill the roles. They'll just have to fill them over and over as people will leave the first chance they get.