Although the totals for Domestic (US) Box Office are not the complete Hollywood revenues picture, Apple’s App Store billings is not the complete App revenue picture either. The Apps economy includes Android and ads and service businesses and custom development. Including all revenues, apps are still likely to be bigger than Hollywood.
But there’s more to the story. It’s also likely that the App industry is healthier. On an individual level, some App developers earn more than Hollywood stars and I would guess that the median income of app developers is higher than the median income of actors. The app economy sustains more jobs (627,000 iOS jobs in the US vs. 374,000 in Hollywood) and is easier to enter and has wider reach. As the graph below shows It’s also growing far more rapidly.