If cable dies, do Fox news and other news networks die? What do you think the future of information will be?

They will have other means of communication. Some demand apps will share the news such as the ABC app (or whatever company will get control over it). They can also communicate via websites, and there could be websites dedicated to providing us news. I know that YouTube also provides live viewings of the news, so that is another possibility.

TLDR: If cable dies, the news will move to another app/website