The article you linked to contradicts the point you want to make. It explicitly says that lack of marriage is bad for countries that have a sizable underclass, which is most countries.
I think both JQ's comment and yours are pretty much non sequitur. The post has one complaint about falling marriage rates; JQ provides defense against a different complaint; and you provide yet a third complaint. All three of you can be correct.
Scandinavia shows that nuclear family formation can occur without formal marriage. But it seems to show that such families do not last as long. The standard complaint is that without pressure towards nuclear families: (1) children will not be raised by fathers; (2) polygyny; (3) destructive tournaments. That is what...
Dalrock writes an interesting article related to Dr. Helen Smith's book the Marriage Strike. I really have to bump it up on my too rapidly growing reading list. (^_^)