There are lots of plausible and interrelated explanations for why the pop-culture future can no longer occur.
I went to a talk last night at NYU by Mark Fisher about “hauntology,” which refers to a kind of intermediate space-time between places palpably shaped by organic time and nonplaces (shopping malls, etc.—see Marc Augé), which are wrenched out of time and posit an unending nontime, the end of history, an undisruptable retailing present that perpetually recurs. I didn’t really get what hauntology was all about: it seemed to have to do with cultural productions that are aware of the nonplace/nontime crisis—the way neoliberalism has foisted non-space/time on us, along with a subjectivity without depth that must flaunt its requisite flexibility by shuffling the deck of floating signifiers—and are “reflexive” and “critical” and “negative” about this condition. Fisher made this point with music: British pop music now is blithely appropriational of the past without foregrounding that in any particular way; retro has ceased to be a meaningful descriptor. So music made now would not be at all disruptive, he argues, if someone living in 1979 heard it. There would be no retroactive future shock. It doesn’t sound like the future; the future that should be occurring now has been thwarted, lost, effaced. The sense of cultural teleology is gone, vanished, perhaps, in the now pervasive relativism that regards all culture product as potentially valuable.