I think it would be interesting to see how fast someone could go if they could do whatever they wanted to their body. Unregulated, no holds, do what you want balls to the wall doping class.
You are already seeing it, you just don't know when you see it. Which also, IMHO, proves that some MOPer who decides to dope, is not all of a sudden going to catapult him/herself to the podium.
At the pointy end of the field, sure, a few percent increase in performance can matter.....so test the podium/kona's and be done with it. Which for the most, I believe is what they are doing.