It wouldn't. Average people just don't like bodybuilding. They know it's unhealthy and that much muscle really doesn't look good. Bodybuilding will always be niche.
Although I don't consider bpdybuilding a sport, certainly it will always remain a niche activity. The oversized bodybuilders with their bloated stomachs is not the only reason why bodybuilding has an unfavourable reputation.
But I still think bodies like that of Peter Molnar have the power to attract more eyes or at least more fevaourable opinions.