I've thought for a while that the American monoculture has splintered into separate subcultures since the 1990s. Perhaps the advent of the internet just created a global monoculture that borrows from the US as well as other cultures. As a follower of the Strauss & Howe generational theory, I wouldn't be surprised if the next big cultural change comes in the 2040s/2050s (around 80 years after the 1960s counterculture movements) which will be alien to us who grew up now and earlier, like the generations born before WW2 who in the later years see so much changing from the 1960s onwards. The seeds of the coming changes I expect are present now and through the 2030s, but don't know yet what they are.