The San Francisco 49ers-Seattle Seahawks rivalry changed Sunday night.The Seahawks did what the 49ers couldn't do last year. They departed the Super Bowl with hardware and rings. They rule this rivalry now.We talked a couple of weeks ago about the 49ers' Super Bowl window being wide open. There's no question about that. But the 49ers have one daunting task -- they must find a way to topple their NFC West rival.In the hours after the Seahawks plastered the Denver Broncos, 43-8, Sunday in to become world champions, Seattle star cornerback Richard Sherman told Sports Illustrated: "the NFC Championship was the Super Bowl.