An interesting read, but the author is very quick to jump to conclusions. I don’t see how an appetite-suppressing drug could have an effect on any other form of impulsive buying. And even if it did, assuming that 100% of users would completely stop all impulsive purchases is rather extreme.
Furthermore, like any medication, it seems to have numerous side effects, including an increased risk of anxiety disorders or depression, which could seriously hinder its adoption.
But this kind of no holds barred futurism isn’t very surprising coming from Hacker News!