Less people are getting married and many people who do get married divorce a few years after. The number of single parents raising kids just seems to be ever increasing and I fear that many kids will suffer because of this.
What's your opinion on this matter and how would you like to see it fixed?
We gotta define "decline" first.
See, first of all, the marriage age in western civilization has always been pretty constant. If you look at the records from the 1600's England, you'll find an average marriage age of 23 - 27 years old. So our "late boomer" generation is actually pretty normal, given the historical standard people view as the "family golden age".
Now, about divorce : Henry VIII and many other rulers divorced a lot of times. And here's another thing : you didn't have to "divorce", you could simply ask for a marriage annulment. A legal loop that was widely used and cheated the numbers for centuries. A LOT of marriages were annuled in history.
John Milton wrote four books on how awesome divorce was in the 1640s.
In 1929, one in six American marriages ended in divorce. By 1940--a year not typically seen as a bad year for marriage--2 million American women filled for divorce. The divorce numbers went lower during the glorious thirties, true, for an obvious reason : florishing economics, war veterans coming back from the war, a lot of babies to make to compensate the losses etc. That's an historical exception, not a rule that would define the family values.
So, divorce is not something new, or damaging. Also, the divorce rate did indeed peak in the 1970s and early 1980s BUT it has been declining for the three decades since. It keeps declining as we speak. If anything, the peak in divorces in the 70's was a social anomaly. An exception in history, not a rule.
Reformed families ? But quite a lot of historians actually think that stepparents and stepsiblings were almost more common than original families in the late medieval period. Single parents weren't uncommon at all in most periods of history. Even in the early 1900's, you had one chance out of four to actually be an orphan before you turned 15, so there's that. People died a lot, incest was to be avoided : so, reformed families were extremely common, no matter which century you look at.
Married without wanting children ? Common during all history. The church celebrated the "Josephite marriages" just for that. Usually, it implies a chaste marriage, but in reality, it was a wayout for couples who didn't want children, were sterile etc. but didn't want to disappoint their families by staying single.
Abortion ? Extremely common in history. Romans used Silphium as birth control pill. Condoms have existed for three millenias and even St. Thomas d'Aquin said that until you could feel the fetus moving, abortion wasn't a sin. Wasn't good either, but not a sin. The abortion rate in the mid 19th century England was incredibly high.
Gay marriage ? Always existed... sort of. Churches celebrated "brother-making" between two men for centuries. Officially, they were simply friends swearing eternal friendship under the same roof, but everyone knew what was happening, and nobody cared much, in fact. And for females, the Boston Marriage was a thing, even not official, but it was still a thing and society didn't collapse.
So, what we may call "decline of family values" really looks like a return to the traditional family system.