Disney owns Hulu, I expect that'll be rolled into Disney+. I might be over estimating Netflix's skill in this area, but I suspect they are really good at converting production money into subscribers.
All that said, none of this is good for creators or customers, it doesn't really matter if Netflix is first, second, or dead.
Disney isn’t going to roll Hulu into Disney+. Why would they when they can charge for both. Besides, Disney+ is suppose to be family friendly. Hulu isn’t it.
Disney doesn’t own Hulu outright yet. Warner Bros still has its 10% stake and Comcast still has its stake for now.
All that said, none of this is good for creators or customers, it doesn't really matter if Netflix is first, second, or dead.