Let all athletes take whatever they want. It eliminates any advantages and at the same time saves money trying to catch guys cheating. I want to see a bunch of jacked 90 year olds. 
Good luck with what you want to see.

I'm not sure your idea would eliminate all advantage. IMO, both controlled and open competitions can co-exist as long as long as it is made clear and only those folks entering restricted, drug free competitions need to be tested. This is already the case. It's not clear to me that drug free contests are well monitored.
Note: I may be bias since I am on HRT. Since there is almost no chance that I would compete, it is a moot point.