I think it depends on what they mean by "DVC resorts". If all they're talking about are the 3 standalone DVC resorts and the DVC sections of the Deluxes, then I don't see why they don't open the Deluxe resorts fully on July 11 at least. Deluxe resorts have smaller capacity than the other tiers and are easier to manage from a transportation standpoint. Limiting bus service would make staying at those enormous Mods a nightmare. And the admittedly selfish part of me is hoping transportation for "resort guests only" means an end to that practice of folks filling the Resort monorail to get to their vehicles at the TTC.
But opening the Deluxes would also give guests who can't get into the parks more to do, with more dining options, recreation, etc, only without the added stress of extra visitors. From a pure $$$ standpoint if they're trying to maximize spend per guest while still keeping low capacity, the Deluxes are a no brainer imo.