They can go up, but unfortunately experience shows that most of the time they go down. In all three of those cases expectations aren't met. If this situation becomes continual, issues begin to build. First related to the problems, then extending into other areas. If your school is like mine here's where the flying monkeys come in.
Resentment easily turns to anger and the downward spiral is in motion.
Left unchecked trust eventually dissolves, positions solidify and factions, based not on the issues, but very much like a Junior High clique, begin to form. At the very least, months of productive time is wasted. Morale can be irreparably damaged and most important, the kids don't get what they need to learn. Grant funding can be lost, and the grant writer along with it. Camels will take only so much weight before they simply sit down and quit.