Agreed. There is this site apparently http://www.correspondencepoker.com/ which seems to attract some players, but to me it sounds incredibly boring for poker. Poker != Chess. And besides, 90% of the mistakes in poker are made because of the overly hasty decisions, we wouldn't want to get rid of that would we :p
Actually that site had me quite enthralled for some time. The main problem was that it drew me back to heads up online play which is incredibly frustrating as it's full of people who play one hand then leave (bumhunters) even at the smallest stakes. That lead to playing at higher levels to find action and eventual crash and burn.