As for the Disney and Fox merger, Disney has been planning two streaming services for a while, one geared toward original content and another geared toward sports.
Sony may not have similar holdings, but it does have the rights to Spider-Man characters on film and some other interesting film properties.
Another studio might eventually come calling as a suitor to buy, and it seems like the studio’s goal to stay ahead of that curve.
Adding Fox’s holdings in terms of TV and movies would give Disney a leg up against competition like Netflix and Hulu, and the addition of more sports content that Fox currently has a corner should help the other, sports-oriented streaming service immensely.