Pop culture really got started after WWII, and it grew exponentially in the 1960s. It grew, along with the various liberal political movements (i.e., the black civil rights movement), in opposition to conventional white culture and its realistic attitudes about race, class, sex, etc. To some extent, Reagan and like minded conservatives attempted a counter-revolution against the liberal ethos in the 1980s, but I guess it failed in the long run.
Most critically, the Reaganites failed to understand the terrible consequences of massive third world immigration, which was happening under their noses. I recall republicans' statements such as: "oh, the new hispanic immigrants are natural conservatives or republicans, because they believe in god." This was, of course, a lot of bull; hispanics are more leftist than other groups (except the jews of course) and have their own racial agenda (La Raza). And, of course, muslim immigration is an abomination from hell. Conservatives were utterly oblivious to the fact that massive third world immigration would doom the white population and the republican party to permanent minority status.
I don't think it's too late to attempt another Reagan like counter movement, but it will be a very tough go. The white population in the US is dwindling at a rapid rate, and the new third world immigrants will not be good allies. The only hope is to field solid anti-immigration and pro white presidential candidates in 2016. And it wouldn't hurt if the candidates attacked the garbage dump american pop culture has become.