Are we meant to analyze jokes here? It might be too heavy a topic for New Year's Day so if it is OK, I would just like to say that, like most envy, I think the cartoon is based on fantasy.
Single or coupled, childless or parent, there are pros and cons either way so I figure it is better to concentrate on the pros of where I am at and remind myself of the cons of where I am not and don't mind if the other "team" does similar. Whatever gets us through, maintaining our dignity... and laughing.