Gotta hand it to Salazar. How long ago was it that he was saying you couldn't be top 5 in any distance event without EPO or HGH? But now, suddenly, he has arguably the top 2 track distance runners in the world. EPO use and HGH use haven't been eradicated, although admittedly they have perhaps been limited somewhat by testing advances. And anyway, his 2 main guys are performing on a comparable level to the guys Salazar was talking about during the "EPO Era." So what gives?
It looks to me like he Salazar has done an end-around. Rather than using EPO/HGH for his athletes, he found other avenues to achieve the same effects. The great thing for him is, even as this comes into the open, he doesn't look all that bad to many. Everything that has been revealed so far, and much of what has been speculated, is legal at least in a technical sense. As another poster mentioned, his athletes will never retroactively lose their medals for thyroid hormones, even if the drugs are regulated more strictly in the future.
It might be that his only regret is that in the ongoing battle to gain an edge on the competition, the little thyroid game is becoming less of a secret. Soon everybody will be taking thyroid meds, and the playing field will be even in that area.
Personally, I find the whole thing depressing. It brings home the inevitability of cheating, or in this case, pushing the gray areas. It would be nice if sportsmanship ruled, and some ambitious runner could go get a cabin in the woods, train their butt off, and mould themself into a champion, but I have to accept that those days are gone (if indeed they ever truly existed).