I've been a cord cutter now for a year and for me its ESPN and then possibly NBC and followed by Fox. CBS is the one that I hope doesn't get it the most due to the CBS Sports Network which isn't available to many regular cable plans even. It was not available last year for the Navy game which was aired on this channel except through means by a bar and your TV provider had it. ESPN has been the most accessible and its Watch ESPN app has been a lot more reliable than the other apps that I have used. The NBC Sports Network app has worked well and is now on Roku, Fire TV, and Apple TV devices. I think NBC does a fairly good job with its coverage too. Fox is okay. I enjoy the broadcasts that it does but its Fox Sports Go app is only available through Fire TV. Knowing this, I recently bought the Fire TV stick just for this reason and it has only worked some of the time through the women's world cup. Currently it sounds like Fox has no plans to join the newly available Sling TV and it doesn't have plans to add its Fox Sports Go app to Roku or Apple TV devices.
Unless you know someone with a cable password that would be willing to let you borrow it. ESPN is the best choice for cord cutters right now and into the future.