Although the 4B threat sounds silly and will certainly be ephemeral there's a serious case to be made for encouraging it to be permanent. Brandon Morse, writing at RedState makes that case very convincingly.
His article is titled I Support the Feminist's '4B Movement' Because I Think Women Deserve More and the entire piece deserves to be read notwithstanding that it's behind a paywall. Here are some of Morse's main points:
I am all for enacting and maintaining the 4B Movement, because I honestly believe taking leftist women out of the mating pool will improve society in many ways.So, all in all, the 4B Movement should be encouraged. It would reduce abortions, diminish the "hook up" culture, force men to develop better character, and be a boon to those women with high standards who want a good man to marry but find it difficult to compete with other women who make themselves sexually available while demanding little or nothing from men.
For instance, ... if these leftist women do stop having sex promiscuously, then the abortion industry will crash and burn. The vast majority of abortions are done out of convenience for the would-be mother, and if they aren't getting pregnant, then they don't need to abort....
There would also be a diminishing of hookup culture, and that influence waning would push other women into having more realistic expectations for their love life and relationship, as it should be.... [Women] having higher standards actually raises the standards of society, making society a better place. It's funny how much sex impacts the quality of civilization when you think about it.
Women outnumber men by and large, meaning the competition for getting a good man is vast. Women are competing with millions of other women for an increasingly small pool of men who are successful, well put together, and physically and emotionally stable. In other words, "good husband material." However, feminists often search for "good husband material" for more selfish reasons.... Many are career-focused and don't want families.
Removing them from the dating pool would allow women who do want to have stable families, raise children in warm and loving environments, and focus on building a good home life to have an easier time finding "good husband material." These will often be conservative women who value and appreciate men, love children, and desire to have a home built on proven values and virtues.
These are the women that deserve good husbands, but it's harder to find them when you have other women in the way. These women deserve more.
Radical feminists might blanch at the thought, but the 4B Movement is actually a very conservative idea and would be a blessing for our society.