I could see that Comcast might have a chance of convincing Fox investors and shareholders to drop Disney in favor of going with them instead. Whether measured by revenue or assets, Comcast is far larger than Disney. In 2017, Comcast had revenue of $84.5 billion and assets of $186.9 billion, while Disney had revenue of $55.1 billion and assets of $95.8 billion. If Comcast successfully outbids Disney, it would seriously disrupt Disney's own streaming service into being far more bigger and attractive to mature audiences. Comcast would own every Fox IP from X-Men, F4, The Simpsons, Family Guy, American Dad, King of the Hill, Die Hard, Avatar, Speed, Greatest Showman, Fight Club, etc.
The Simpsons land at Universal parks in L.A. and Orlando would be transferred from a 3rd party IP to a Universal-owned asset and Pandora land at Disney's Animal Kingdom will still remain a 3rd party property, only this time, Disney would have to fork over the Avatar money to Comcast, similar to how the forme forks over of the merchandise money to Disney in regards to MSHI. Disney would lose tons of money from exiting the deal with Fox. So yeah, it demonstrates that Comcast is being very committed to beating Disney in all levels, including the entertainment and theme park arena, and would increase the level of competition in both areas.