There would be far less following. People like to see how freaky someone can get using massive amounts of drugs. Almost like a lab experiment. Take drugs out of it and there really wouldn't be much to gawk at. Plus, you'd always have people doubting that whoever on stage is actually natural.
Mr. Olympia would be 220lbs.
They would all shrink tremendously, minimum of 35lbs less come contest time and not as hard.
I would be more interested in the sport to see what people can actually do without all that shit.
It would be sad to see such a perfectly demented event become civil. After all, that's part, if not all of the fun in watching. If all goes well, by 2020 Mr. Olympia will have a 48" waist and weight 380lbs. Can't wait!