I think of Comcast as a cable/internet company. And I thought Disney wanted it because they want to unite the rights to their properties and to continue to build a monopoly. I admit I’m not the most informed on this matter, though.
Comcast is basically an entertainment company like Disney at this point. They own Universal, NBC, and a variety of other companies. Disney certainly wants some of those leftover Marvel rights, but who else doesn’t want a piece of that action if they can get it. Plus that’s just one small aspect. No one would pay that many digits just for X-Men, Fantastic Four and Star Wars 1-6 distribution.