Allow user to be able to see what will be the impact of permission changes

Currently, there is no indicator on what could happen to an instance if some permission schemes were changed or edited. As a result, such changes could have some serious consequences (such as loss of access, lost work, etc).

It would be great if users could somehow see an indicator of what the permission change would bring about. For example, the users in that group (list of users) would no longer be able to perform action X.