The bottom line is that a LOT of people just are not appropriate for having and raising children. Many reasons.
However, society needs "concepts" for people like that. Labels that people can wear proudly that say they are not part of the child and family part of society--that they have another role that does not involve marriage and children.
Not "old maid" or "otaku", but something respectful.
As example in China is the old tradition of the "Amah", a woman who is not going to get married and have children, who instead lives with a non-related family as a combination assistant and nursemaid. They pay her room, board and a stipend, and treat her like a "maiden aunt" living with them. Only some were lesbians, most were just "extra females" whose families could not afford dowry, but were not debased, like prostitutes.
People who are not part of marriage and children can then get out of the way of those that want marriage and children, instead of competing with them because they don't know what to do otherwise. It is frustrating for men and women who want to get married to date someone who doesn't, waiting for weeks or months before they mention it.
On top of everything else, a LOT of people who shouldn't get married with intent to have children want to, anyway. Often times they just can't stand the *stigma* of not being on the marriage/children track. And yet this programming often leads to disaster both for them, those they marry then divorce, and any children they make but didn't want.
Social systems like family, churches, doctors and counselors need to step in and encourage people they don't think should marry, *not* to. Such advice has been condemned for many years in our culture, and it shouldn't be. Romantic notions such as "love conquers all" have caused immense pain and suffering. Especially when you are young and dumb, you need advice on what works and what doesn't.
In past, even arranged marriages offered more stability than just "leaving it up to the kids." At least you would have *something* in common with your spouse, not just mutual lust.
We should be amazed that *anybody* can meet a mate and get happily married at all, just on their own. Would you tell a teenager to just take all his money, and spend some of it on a car without asking anybody, even a mechanic, about it?
In the US, except maybe in Utah run by the LDS church, are there any chaperoned social events where polite young men and women can meet, converse, socialize, and practice their manners with each other? Say from ages 16-25, if not all together.
And if they do get together, get married and want to have children, look how hard it is. Two entry level jobs and an apartment, it could take 10 years to get to the combined salary of $40k they would need to pay a mortgage on a house.
So there are social changes that are need both for non-children people and child-bearing people. Not more government, but new societal paradigms. To teach children that not everybody will or should have children themselves, and that there are other things to do in their lives if they don't have children. And also to make things as easy as possible for people who want children to have them, even to the point of subsidizing those that are really good at it.
I have a friend who had to marry his school sweetheart at 16 due to an unexpected pregnancy (circa 1970). They had twins and a pretty decent life. The kids turned out pretty good and were out of the house at 18. So my friends did their parently duty by age 34 and have enjoyed an empty nest since, except for entertaining grandkids.
And to think in a little more than a week I'll be going to a convention that uses otaku as pat of its name.