First off. Hollywood Studios has a dramatic audience retention problem, and it is now also a dramatic attendance problem. Actual attendance figures are basically state secrets and the "attendance estimates" circulated every year are basically BS on a stick, so instead I am going to point to evidence that anyone can investigate using publicly available data and experience.
Much has been made of Animal Kingdom and the "3pm problem" where most of its guests are ready to peace out after six hours. The truth is, Hollywood Studios has the same problem and it really began to show after Wizarding World of Harry Potter opened. Universal Orlando successfully pulled a day off of the typical one week Orlando visit and this is a day that would have been spent at Disney. Probably half at a water park and maybe the evening at a theme park. Or maybe at DTD or at the pool or riding horses at Ft. Wilderness. Whatever. What most guests ended up doing was shortening their time spent at DHS and DAK and consolidating those visits into other activities planned on the same day to accommodate for the time spent at UO. This means Disney still gets that "first click" daily attendance math that gives DHS and DAK abnormally high yearly attendance numbers, but the truth is those visits are shorter and guests are spending less money. Go hang out at the Backlot area of DHS on any given day after 6pm and you will see this in action. It is a ghost town. Star Tours 2 routinely is a walk on in the late evening at Hollywood Studios. Star Wars is a keystone of the upcoming plans for DHS and one of the most popular rides at Disneyland Park in Anaheim at all hours of the day. For this ride to routinely operate as a walk on in Orlando, something is very wrong.