Well, each time he loses, I hear the same question, should he retire ?
Carlos is playing good this year, he made some good results, he won a title, so for me, he's not finished, it's just that Davydenko played great today. And, Carlos got a difficult draw this year in Paris. I prefer him losing against Davydenko than against an unknown player.
I saw Carlos practricing several times in Roland-Garros and I'm sure he's still motivated to play and will stay "with us" a couple of years