Subcultures Becoming a Part of Dominant Culture?

Hey everyone, so I've noticed that throughout our discussions of dominant culture and subculture, we have never really talked about subcultures completely becoming a part of the dominant culture. An example I would give is hip-hop: Despite the countless numbers of examples for hip-hop showing the dominant cultures' characteristics (Having a majority audience of white teenagers, something that's been accepted by even the President of the United States [ Seen when President Obama allowed Jay-Z to introduce him ], etc.), we've always said that hip-hop is a subculture. But as the definitions of dominant cultures and subcultures inevitably change in several years (Whether that be two, a decade, or even 100 years), will we still call hip-hop a subculture? And more importantly, can a subculture ever truly transform into something that is a part of the dominant culture?