Will popular music continue to recycle older styles that have consistently found mainstream appeal?

Or, will popular music continue to evolve through the infusion of elements from new sound sources, such as the cross-cultural styles heard in Afro-Celt Sound System and Wagakki Band (World music) ?

Popular music can do either of those things, but popular music that stays well known and popular for years and years are those songs and albums that give the people something they have never seen before. Think of some of your favorite artists from the past: Queen, David Bowie, Elton John, etc. They all brought to the table what no one else was able to do and I think those leaps of faith speak for themselves. They are what keep the development of music going and pushing into the future instead of recycling the same old beats until you're beating a dead horse.