Man, they work on upgrading things every time they have the chance. My mom was a teacher before she retired, and I can tell you that she was working all the time when she was off (evenings, weekends, summers etc...) to improve her offerings to her students. There isn't an "end game" for teachers. They are always working and always trying to improve (obviously, there are the minority that are shitboxes, but they're the minority and they can lick my taint...)