For a more rigorous refutation by a trained professional, please read: http://www.sciencebasedmedicine.org/?p=1248
I'll pull the zinger quote from the article above for you:
>No, it’s not like that at all. Perhaps the studies are just that well done, or maybe the drugs being developed suck, or maybe companies are studying more candidate drugs and screening for efficacy. Just about any explanation that doesn’t involve aliens is better than “placebo is getting stronger”.