What, havent we done this like 3 pages ago? Some people make it sound like players who show slightest signs of decline need to be shot in the head immidiately. Cech may declined, but he is still is pretty **** good and quite young of a goalie. Some of them don't even peak before they're 30.
Admitedly i would label him as "physical" goalkeeper who has enjoyed success through his excellent athleticism, footwork, ridicolous arms reach and intimidating opposition with his large frame, rather then through positioning and anticipation, and they generally decline earlier. But i wouldn't give up on him just yet.