You forget one critical detail though, the political pendulum doesn't swing in one direction permanently in a liberal democracy.
Right now the only reason why everything is leaning towards the Right is because the stars and the planets have aligned to create a perfect storm that favors the rise of the Right. Trump being in power and populist movements starting around the Western world is a trend but trends aren't forever.
Sooner or later, the stars and planets will align differently that will eventually heavily favor the Left again and the Right will find themselves losing the culture war again.
Look man, I'm old enough to remember when American Christians dominated public discourse in regards to the topic of homosexuality and it seemed like the Christians were never going to let gays have any rights in America because the Religious Right dominated political discourse back in my day. Then the 2000's happened and suddenly the Religious Right found themselves badly losing battles in the culture war in regards to gay rights; the Left won in making gay rights a thing in America and the Religious Right badly lost.
I'm willing to bet that by the time Trump is out of public office and as we enter the next decade, the political climate will probably not be right-leaning anymore by the 2030's and the political climate in the future will look vastly different compared to how it is now.
Unless America becomes a dictatorship tomorrow, the political pendulum will always keep swinging in both directions because liberal democracy never allows the pendulum to swing only in one direction forever.
If anything, I'd like to argue that countries like North Korea, China, Iran, and Russia won the culture war in their own counties a long time ago because they have authoritarian governments that crack down on any political dissidents to ensure that any outside ideals never disrupt the thing they have going for them (you can't have a culture war when you have a dictatorship controlling how people think).
The culture war is never going to end in America (or in any Western country) because liberal democracy doesn't really permit the culture war to end because liberal democracy allows all political viewpoints to present themselves on a platform.
Unless America becomes a dictatorship tomorrow, the culture war will never be truly won by anyone in America (neither the Left or the Right in America are going to truly win the culture war unless either side finally has the balls to establish a dictatorship so they smother any opposing political ideologies from existence in order to establish both social and political stagnation).
