I think it's permanent, it will just change shape and be less radical. The hippies are still a bit hippies deep down inside, and their main objective has been achieved. People know they can be hippies and it will be fine. I am more unsure as to why subcultures have been ostracized in the first place if they do no harm to others. When I lived in a huge city for the first time, i realized how unimportant all that was, I got to speak to all kinds of people, name any -ism, I have spoken to them, and they have all been nice folks.