I could be wrong but imo a 4B like movement is unlikely to take off in america.
it seems obvious to say, but like the culture is pretty different.
Korea was relatively late to integrate women into the workforce.
Domestic violence rate I believe are higher.
overall marriage satisfaction is lower.
the returns to getting married in america are still pretty high, the happiest people in american are married adults.
Korea is pretty different in that being in heterosexual relationship with men was probably negative expected value.
not really so in america. most heterosexual women are gunna wanna get married and be in relationships with heterosexual men.