TTMR
Hall of Fame
My problem with this argument is this: Everybody on PEDS is not the same as everybody off PEDS. Everybody on PEDS allows Novak and Rafa to play their grinding, attritional tennis for 5 - 6 hours, match after match and ultimately win out. If they were not on PEDS could they play this way and dominate against a clean field? Would a faster attacking energy saving game like Federer or Delpo (i'm not saying their clean) dominate in this environment? I think it would.
There's always the option of speeding up the courts a little and/or converting to lighter balls. Both of those are more feasible than realistically removing PEDs from the sport, especially in the upper echelons.
I also disagree with your idea that Nadal and Djokovic only dominate because they play a "grinding, attritional" game. They are the best at adapting to current conditions. When they play each other, they are both so fast it turns into a war of attrition because the courts and balls do not enable them to hit through each other.
Nadal played attacking tennis, including some serve and volley at Wimbledon 2008, and that was one of his best performances ever. Djokovic is an aggressive, offensive baseliner who only differs from the 6'5 giants like Soderling and Del Potro because he is also able to defend brilliantly and can take cuts on both sides of the ball, not just the forehand, while Soderling and Del Potro just give up on a lot more balls, making them appear less like 'defensive-minded' players.
I've also never seen Federer gasping for air in five set matches, even when he is running around on the baseline going toe to toe with Nadal and Djokovic. Does Nicolas Mahut look clean to you? He runs around like a jackrabbit after three continuous days of tennis. Yet he plays 'attacking' tennis. Linking playing style with PED use is highly tendentious.