I'm going to disagree and say that I think there are limits to PE, at least for now and what is known to the community. The comparison to bodybuilding is interesting, but bodybuilders have a lot of scientific tools to use--AAS, HGH, insulin, synthol, etc.--to keep pushing to new limits. PE has not really developed tools that parallel those. Maybe in the future, chemical PE will be more developed.
However, I think with our existing tools--pumps, clamps, hangers, [words=http://www.
phallosan.com/shop/catalog/default.php?z=eNortjIxtVKyL0pNszWxMFcrSSxKTy2JL0hMT7U1UisoykyxtbBQSy4tLsnPjS8uKcrMS7dVsgZcMMpbEbo%2C]ADS[/words], etc., we can still gain a great amount of both length and girth.
Also, that guy Muscle Eddie seemed to find a way to become absolutely monstrous. I'm not sure of his techniques though.