If people are expecting to be sitting in the same seat in two years, that makes what they do default-converging.

(As long as they are competent at their job!)

They will think about the indirect effects of their actions and account for them.

"Sitting in the same seat" means they don't expect to be fired or want to leave because they don't like the role.

People who will still be in the seat have a naturally long-term perspective, since any problems in this org they create will become their problems.