Disagree... I think the Elaine character (and Julia herself) were key elements to this series. I don't think the show would have been watchable with just the three men characters. Elaine, I think, was equally funny to all of the other characters. I mean she wasn't funny every episode, but none of them were histerical for all 180 episodes.
Seinfeld should have a reunion episode (as Jerry Seinfeld has hinted at in passing).