Content producers get to decide the economic model. They effectively have a monopoly on content people want to watch. And they've decided that Widevine/PlayReady/FairPlay DRM is what's required. And all of those require by design an online server to enable access to the media.

All of those services will one day deprecate/retire their servers, and all paid content downloaded to your devices today will become unplayable. Your granddaughter won't be able to watch any films she finds on your old iPad she finds in the attic 100 years from now.

Unless you can convince studio execs that they will earn more money with your new economic model, it's going nowhere.