Hello Jeanette,
If the instructor cannot switch back to the old gradebook because they switched an individual course over to the new gradebook and then made use of some of the new gradebook features in that course, then that will have no impact on the other courses at all. They will still be using the old gradebook.
However, if your school has completely switched Canvas over to the new gradebook (as ours has), then both old and current courses will be using the new gradebook.
As for what the "consequences" are, can you be more specific about what you want to know? The new gradebook has some features that the old gradebook did not have, and vice versa.
Mike
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