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Yes, I'd say it's likely for now.
It's not just manga. Media in general has become more sexually explicit — see how many american tv shows nowadays have explicit sex scenes in every episode.
Comics and manga are just elements of media following this trend. It might be a response to a sexually-deprived culture to massively consume explicit material once the morality surrounding sexual behavior becomes more relaxed.
It will subdue eventually, after it becomes "normal" and no longer attracts attention for its novelty.
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