From the study: > A logical next step would be to carry out a placebo controlled randomised trial in which the level of therapist contact is consistent between conditions. http://www.thelancet.com/pb/assets/raw/Lancet/pdfs/S22150366... Depression studies are subject to well-known, powerful placebo effects, rendering this study's conclusions next to useless: http://blogs.scientificamerican.com/cross-check/are-antidepr…
Secondly, if a placebo has a really high rate of success, and less side effects than currently available medication, then it could still be interesting.
And thirdly, it's going to be really, really hard to test against placebos. They're using quite strong doses to get these results, and I think it would be very hard to not realise you weren't getting the psychedelic effects unless you went into the test with literally no prior understanding of what effects the non-placebo drug would have.
But yes, a lot of research still to do. I'm rather optimistic, though.