It's not yet obvious how many more cases there will be. There probably will be more initially as people want to challenge things they previously didn't expect t

It's not yet obvious how many more cases there will be. There probably will be more initially as people want to challenge things they previously didn't expect to be able to win because the courts would have deferred to the agency. But you also eliminate all the cases where an agency would change their interpretation, get sued, change it back, get sued by someone else, etc. Once the courts have established a precedent for that rule, there should be less flip flopping and consequently less litigation.