Aren't university teachers saturated? Why are they still hiring every year?

It's different now. The higher the tuition fees for students, the greater the requirements for teachers. In fact, teachers have professional titles. Most schools do have many teachers, but not many teachers with high titles. Just look at the recruitment information. Therefore, every school hopes to have more teachers with high professional titles, and there is competition among teachers. Unqualified teachers will be brushed off.