Unless park hopping is "stopped" (which is a decision made on a daily basis), you can park hop, even if reservations are no longer available for that particular park, and provided you do not have a ticket that is blocked out of that particular park. For example, Cast Members are currently blocked out of certain parks - they are unable to make a reservation for that park AND they are unable to park hop to that park because they do not currently have valid admission. If you do have valid admission to the park, you can continue to park hop (even if reservations are full), UNLESS park hopping is stopped due to capacity. In theory, this will be similar to an old phase closure.