I would imagine so. Disney's biggest deals seem to have been with Hulu, so owning that outright gives it a lot of power to change deals, and with Netflix, which presumably part of the timing that Disney+ won't roll out until Fall is that coincides I believe with the expiration of the biggest of Disney's streaming licenses to Netflix (the one for access to films). (The Defenders MCU shows exclusive contract to Netflix I think will still take a few more years to expire before Disney can bring them "home".)