You could be right. But then why wouldn't they come up with some compromise for the 4 or so years their teen is still at home?
Compromise is a very misunderstood thing.
If one person wants to break up immediately, and the other wants to wait 4 years till the youngest son is out of his teens, the 'immediately' wins, as a practical matter.
There is no compromise when one side presents a flat 'no.'
The woman I am dating wants no children, period. I want four children, and I am open to adopting one or two more if my future spouse is open to that.
There's no compromise there. The 'No' flatly wins. Thoughtless people think that a compromise would be less than 4 children (maybe 1 or 2). In fact, that's not a compromise at all but a complete surrender on the part of my galpal.
The solution (not a compromise) is for one of us to give in, or marry other people someday. It will likely be the latter (but it doesn't stop us from enjoying one another for now).
Life is not predictable. Responsible people try their best and fail. Prager's wife knew he had to run around a lot. He'll be back. Their teen will learn to run around the world early and then settle down. Join the AF and learn a tech skill faster than in college with 12 hours a day mandatory study and visit 8 or 9 countries in the process while meeting a bunch of different people in 6 years. That's what I did. It pays.