I predict that there will be no "one-stop Disney shopping". With a few obvious exceptions, there will be little of the charming old Disney material from 1930s-1970s, at first. Then a year or two after launch, we'll see the announcement "Due to public demand, we are now offering CLASSIC Disney+ featuring our entire "classic" Disney library". This will be a separate service or at best a paid upgrade. So you will need more than one Disney streaming service to get all of the content.