Depending on the amount of time you have and your "risk" tolerance actually saying "I want to cancel" is a great tactic. It usually puts you through to that "retention" department and they might try to persuade you. Or they might not. The problem with actually canceling is you would usually have to send back your equipment, and then when you want to re-hook up there are fees and they have to send someone out. If you have a flexible work schedule to be home all day, it might be worth it to do it, especially if you could hold out for a full month without cable.
Another option is to call and say I want to lower my package. Try to get anything lower than your $90 package, ask if there is a "local only" option, like "digital starter" or "digital economy." Economy appears to be a long term rate at $35 a month with no ESPN. If you can tough that out for a month or two, you should be able to get some new offers for your higher package. (Or, you might learn that you don't need the higher package!) However, if football is the issue now is probably not the best time. Remind yourself to do this when whichever sport is in the off season. Or, perhaps there are other sources I'm not aware of as a non sports fan.
It also looks like you have 3 TVs with cable. It would save you about $25/ month to have just one TV. Perhaps hook those other tvs up to a Roku and an Antenna or a DVD player? How often are they used and for what?