If this deal goes through, my opinion that it would have negative consequences for Comcast as well as the Fox properties and entertainment industry as a whole.
1) It would be twice in the row that Comcast's Universal theme parks would have to pay for a property owned by the House of Mouse (Marvel Super Hero Island at Islands of Adventure, Marvel's Spider-Man at USJ, and The Simpsons Land at USF and USH).
2) You won't likely see CBMs like Deadpool and Logan made under Disney anymore due to being raunchy, violent R-rated content. I'm not saying Disney making R-rated movies is not plausible, but unlike other major film studios, Disney hasn't released an R-rating movie since 2011, after selling off Miramax and reduced Touchstone Pictures of that of a production company. People might point out Marvel's Netflix shows, but Marvel Television produces them, not Marvel Studios. It's well-known fact that Marvel Television and Marvel Studios don't get along well despite being under the same roof and Marvel Television subcontracted Netflix to make the shows (that's why MCU and Netflix's Marvel shows made no mention of each other). Disney's MCU nowadays are aimed to be family-friendly with generic and oversaturated plots on the cinematic screen with the intent of selling the merchandises families and kids want. It's on Disney's DNA like it has always in the past 90 years.
3) American Horror Story, a Fox's property, couldn't be used for HHN anymore unless it's shown to be grandfathered in.
4) Universal theme parks would have to license more properties, especially for the 3rd undeveloped theme park in Orlando.
5) It would make Disney far more powerful and too big, giving them more leverage over the entertainment industry (e.g. by threatening independent-film studios and major studios which doesn't get the chance), given its recent behavior towards local theaters for the Last Jedi and the Los Angeles Times which exposes Disney's questionable or immoral leverage over the city of Anaheim (that's why Disney blocked LA Times from screening the movie in attempt to silence free press).
6) Much of Fox's properties such as Predator, Alien, Die Hard, Family Guy, Apes, The Simpsons, 24, King of the Hill, American Horror Story, American Crime Story, Bob's Burger, Archer, etc, are not suitable for Disney theme parks due to its mature and adult-oriented content. Disney parks are ALWAYS supposed to be family-friendly, that's why they don't have a HHN similiar to Universal's HHN and Knott's Scary Farm.
But suppose we switch it around and see what happens if Comcast actually succeeds instead.
1) It would simplify the theme park rights for The Simpsons
2) It would continue to allow Fox to make R-rated X-Men movies for possibly unlimited time should Comcast acquires the character rights without restrictions. It would put Universal back on the comic book movie trend since 2008.
3) The distribution rights to Star Wars — Episode 4: A New Hope will be held by Comcast. This could be seen as some trolling to Disney and hurt the Mouse's chances to get all Star Wars movies under its roof. Can you imagine the pain of negotiating when the anniversary is coming up and the like?
4) It gives Universal Studios many of the valuable Fox's IP to develop movies, more TV valuable shows (that is currently lacks), and using them for the theme parks and their expansions without having to obtain so much properties from 3rd party companies.
5) Comcast would likely to have Fox and Universal stay seperate and Fox would be part of NBCUniversal Filmed Entertainment Group. Maye a joint Universal-Fox intro in the movies would be good if Universal gets a chance to distribute their movies.
6) Comcast would keep the directors in place since Fox Searchlight gives them a chance who were declined so many times, even Disney.
As much as I love Disney, if given the only choice between Disney and Comcast (as crap as they are), I rather Comcast get it instead of the big bloated asset Disney. It would make the competition between Comcast and Disney much innovative, after how the success of Universal's Harry Potter turned out, which forces Disney to develop innovative rides like Avatar and the upcoming Star Wars Land. Disney being too big by acquiring so many popular brands is just too much and won't be good for the entertainment industry in the long run.