I agree with point II.
I do not believe I, III, and IV are necessary, because animated avatars and colors/sizes of text are not currently used to excess. There are a few people who post in colors, and others have made it clear they do not read colored posts. So for people who like colors, it's their own loss that their words are being read by fewer people.
I disagree with V. I would have no problem with signatures being limited to a certain number of lines of text (to improve readability) but I don't think it's necessary per se because long signatures haven't become a serious problem. But signatures add a touch of personality and individuality to people's posts - a good thing IMO.
I strongly disagree with any attempt to impose arbitrary limits based on the desire to avoid an environment of partiality. I don't want to turn this into a political debate, but history has proven such attempts to be ineffective and futile.