The sexual revolution won out, the hippies socially liberalized america, hip hop is the dominant mainstream culture among todays youth. Today for someone to be countercultural and against the grain they'd probably have to be republican or something and dress like a square. Has the countercultural revolution so many years ago now become the dominant culture? and if so then are there any countercultures today?

Counterculture produced alot of great music in the 60's and 80's/90's, now maybe this is one factor as to why today's music is stagnant.

Plenty.

tons of them you just have to know where to look.

It's hard to keep a secret with the Internet so prevalent.