First off, we are all pretty ignorant, so there is little use in using this label as a derogatory.

The issues that those who fight for "social justice" are often human-produced climate change and group oppression, often tied to traditional deviance.

Our much larger and more socially transforming and catastrophic circumstance in the future will be population decline.

Fewer people will be generating whatever is supposed to be human activity that is theoretically driving climate change.

Much of the groups who are identified as oppressed are deviations from multi-century traditional behavior, mostly to do with liberation from social responsibility and culpability. Tolerating and practically encouraging such liberating deviations actually contribute strongly and immediately to population decline. LGBTQ… people don't tend to conceive, birth, and raise children into adults that will further conceive, birth and raise more adults - this is against their liberation ideology.

Fatherhood

It isn't useful to listen to the women who say they don't need men - they are tragically wrong. Of course, it is horrendous to be married to such a woman and especially to have children by them, but a part of husbandry and fatherhood is the overcoming of obstacles to what must happen. You must have at least four children per couple. A family of this size is not viable without having two adults leading it. Insisting that single parenthood is acceptable and laudable, forcing the larger society to make up for the lack of (usually) a father, is not sustainable. We cannot create systems that produce future adults outside of the NaturalFamily - such systems don't work.

Social Justice Warriors working on More Pressing Causes

So, if the SJW set were to get more interested in addressing the issue of population decline, I could see multi-colored young women and young men coupling up (marriage might be re-enthoned as a requirement for the over-sexualized set) and conceiving many children in a "what does love have to do with it" militant style.

Or they will decide that "The Handmaiden's Tale" is a pretty good model and passing around vials of Adonis semen to be the next Nazi Party activity to re-populate the world with Aryan aplomb.

In any case, the SJWs (our modern "utopia"-forcing Nazis) can continue to harass people and march for empregnantion and perhaps conception camps and indoctrination of the rising generation to breed prodigiously to service their elders. Given the fact that religious groups are more productive in larger families, the SJWs might become enforcers to making this situation happen to the current crop of unwilling youths. The entire culture has to change and lionize those who produce (at least) and perhaps raise children in a sexually productive way. Perhaps the SJWs will force arranged marriages and social punish (in the cruel and effective way they prefer) any who don't go along. What an interesting turn-around!

Is God and the mechanics of his Plan at the heart of this?

The self-serving attitude of the wicked tends to discourage marriage and childbearing, causing all the problems.

One can't cherry-pick which of God's dictums are kept and how it affects them. One must keep all of God's commands in these times to make things work. Partial obedience to some commandments appeared to work in the past, but as the end looms and we approach the time of judgement, tolerance for deviation narrows to nothing and our collective ability to avoid the consequences of disobedience will cease to work. In the way of social justice's self-appointed "morality", which is little more than narcistic liberation from responsibility and consequence and short-sighted virtue-signalling, we already see it breaking down in the face of reality and truth.

What might a dystopian story based on this might look like?

• Feminists rounding up beta males to "milk" them for sperm and sell it on a black market. This works far better than the government tax incentives to turn over newborns to federal nurseries?
• Women often eschew girlboss jobs to become mothers, but do so with same single-minded ruthlessness, often making it into a baby-making business with compliant girls that are pressed into service. Babies are often taken as premies (a whole science is developed to shorten gestation) and to quicken turn-around on another conception.
• infants are collected into "federal nurseries" for grading and endoctrination. "Damaged" babies are either destroyed or raised (fattened up) on secret "farms" for organs. Of course, there is a lively market in tricking the authorities to buying damaged goods at market prices.
• Some couples do things more traditionally, but out of the way of the crazyness of larger places. There is a lot of child-snatching so parents have to protect their children. *