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It's very doubtful that Disney is or could be an serious issue for Netflix now. Netflix is approaching - or already larger than - the size of Disney's comparable entertainment business, and Netflix is growing relatively fast whereas Disney's business isn't growing much or at all. Disney's studio division does $8.3 billion in sales. Their media networks arm, which includes ABC & ESPN, does $23 billion. Netflix will hi…
I don't know how much business 21st Century Fox does compared to your numbers, but Disney is buying "most of" them[1] http://money.cnn.com/2017/12/14/media/disney-fox-deal/index....
An acquisition like that might be as likely to throw Disney into chaos as anything and give Netflix a leg up on stealing market share, given the corporate history of very large acquisitions.
That also of course depends on what the Netflix growth profile looks like over time as well.
For example, does Netflix routinely still generate 15%-20% annual growth after they're up over $20 billion in sales? If so, there's nothing Disney can do to stay with them short of continuing to buy up the rest of the entertainment universe.
The global subscriber momentum Netflix has now is incredible. By the time Disney figures out exactly how all of their streaming pieces are going to fit together, Netflix might be up to 250 million global subscribers.