Ballot measure passed in Oregon last fall allowing psilocybin treatment centers staffed by licensed mental health professionals. It's gaining steam.
I think the greatest societal application will be in addiction medicine; but there is evidence for mood/anxiety disorders, PTSD, and other conditions.
The history of this is really interesting. I'm sure you've read Pollan's book already "How to Change Your Mind"
When valleus chimes in, we should listen up