What is generally considered a "safe harbor" against admission rescission?

@nrdsb4 The response was sarcasm on JOD’s part. He has made his view’s on senioritis clear in another thread.

As for what colleges will tolerate, obviously it varies. Colleges have gone to the effort to admit a student, so they want that student to come. OTOH, college can be a challenging transition for some. They don’t like to see indicators that a particular student may have difficulty managing that transition.