Completely untrue. Michael Spinks, Evander Holyfield, Roy Jones Jr, James Toney, David Haye, Tomasz Adamek, Jean Marc Mormeck, even Antonio Tarver have all had heavyweight fights and 5 of them have won world titles, although Toney didn't keep his.
The heavyweight limit is already very different and much higher from what it used to be and is essentially already superheavyweight.
Rocky Marciano, Joe Luis and Jack Dempsey all weighed under 200lbs and would be fighting in the cruiserweight division in today's weight limits.
Considering they are three of the top 10 greatest heavies of all time, arguably top 5 it's really hard to justify having another two weight divisions above them.
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