By the way, in a couple of months I'll be facing similar decisions. I think I'll keep the Amex Plat for the benefits, and the CSP for 2x on dining/travel. I don't spend enough on airfare for the Gold to be worth it for me. Other than that, I intend to cancel/downgrade basically every other card I have (CO, UA, Citi AA, Citi Visa, Citi Biz, Chase BA, Barclays US).

My goal is to keep probably one Plat for the benefits (between me and my wife) and for each of us to have the CSP and maybe the Starwood Amex (which will be part of a future round of apps) long term. All others I'd likely cancel before the next annual fee hits.