Hippies are as extinct as cowboys. Sure, there may be some out in the jungles hiding with the mokele mombe, but most of what you think of as hippies are actually trust fund kids too stoned to take showers. It is a far cry from the free love, reject all existing paradigms, flowers for your gun barrel hippies. Hell, they couldn't compete in that form to the new evolution of crowd control authority figures.
So, yes, cowboys, triceratops, and radio drama stars should all be permitted to play, and every effort should be made to preserve their species, in case we find out that they have a gland we can extract anti-cancer medicine or really good chewing gum from.