Even before the areas where closed, Hollywood Studios already offered a limited number of attractions. Yes, it could fill a day if you did all the shows. However, it does not match up with the Magic Kingdom (especially) and Epcot in terms of things to do. In comparison to the Animal Kingdom, it lacks the same immersive environment.
Now that multiple things are closed, it isn't just about what's been closed. It's about the park being incomplete. There are some good attractions, but it doesn't justify the nearly $100 per day price tag. I realize that people are going on park hoppers, but it's still an incomplete experience.