WDW can very easily check who is staying on-property and what kind of tickets guests have. With a tap of a MB or plastic ticket, WDW knows in an instant if you are staying on property and what kind of ticket you have. Will they put guidelines in place? No one knows, but if they do, they already have the technology to determine quickly any type of on-property, ticket or other membership-type of status (DVC, AP, etc.). This is how they let guests in for EMH, hard-ticket parties, DVC and AP specific park events, etc.