Like almost any other grouping of people you care to think of, hippies have changed since the beginning.
In ancient times there were people who lived in ways we might call hippyish, and in the Middle Ages too. Then of course Bohemianism arose in the 19th Century, and hippies as we know and love them appeared in the 1960s.
Hippies today are different again, and sometime in the future there will be people who'll recognisably be hippies but who will be very different from the hippies of today or of the 1960s & 70s.
What do you think the differences and similarities might be? How soon will certain changes take place? What issues will the world of the hippy revolve around? Feel free to extrapolate and ramble at length.