Have to disagree. I remember back in the 1970s when the same question was being asked. Now people generally look back on the 1970s and recognize that a lot of great (rock, R&B, fusion, reggae) music was produced. Maybe in another 20 years most of the music from that era will sound really dated and fall out of fashion. I think our perception of what is "good" is malleable and often new music is disparaged as noise and then appreciated more and more as time goes on.
And then there's the age issue, people will go through life strongly identifying with the music they listened to as they came of age. Older people may not like rap, but it may be viewed as great music in coming decades. It has already infiltrated other genres (like country) and there are interesting and melodic rap-influenced rock bands where musicians are back to playing real instruments. New acoustic bands like Mumford and Sons seem to be incredibly influential if the number of imitators are any indication.
And then there's the age issue, people will go through life strongly identifying with the music they listened to as they came of age. Older people may not like rap, but it may be viewed as great music in coming decades. It has already infiltrated other genres (like country) and there are interesting and melodic rap-influenced rock bands where musicians are back to playing real instruments. New acoustic bands like Mumford and Sons seem to be incredibly influential if the number of imitators are any indication.