I'd say Korea is actually winning the cultural war. K-pop has taken the world by storm. Hollywood is in decline, if you'll notice, good movies are harder to come by nowadays.
Are you sure about that? It sounds like a deeply biased statement.
Big Hollywood is repeating itself, stakes are too high to embrace creativity, investors want a rock-solid path to success. Netflix is making uninteresting synthetic data-driven content. HBO made a stake on soft porn.
Author/independent movies are on decline too. Look at this year Oscar nominees: how much of them you feel you really should to watch?
Two of those are netflix movies - Irishman and Marriage Story, I don't see them any more synthetic than 1980's RAMBO 2-5? or God Father 2,3 etc. Movies were always based on the popularity, the difference being the better data.
> bad comic adaptations, getting their rating from wide fan base
The amount of haters and lovers might not offset each other perfectly, yet it should not matter after the hype dwindles. Besides, the top rated comic books adaptations are quite good - Joker?