(It changes a little; culture doubling time, I believe. But is anyone really going for cultural victory?)
Oh, and how would anyone actually succeed at cultural or diplomatic victory? You'd really have to allow the person to win. Cultural is lost since everyone just declares war on you. (Only possible to succeed culturally if close to conquest/domination.) And diplomatic is not really possible since everyone will abstain. I guess you'd have to be really, really nice to everybody, or we could just ban spiteful abstains.