Even when we assume that certain things have remained constant—that people fall in love, that they subconsciously seek to prolong the species by having children—other enormous changes have taken place, mainly because of economic and sociological factors that have little to do with the experience of the Church, and more to do with society in general.
The immediate ancestor of Christian marriage is Jewish marriage, and the focus of Jewish marriage is to do with contracts.
Change may or may not be good, but it always carries anxiety in its wake.
The answer to some of the problems posed by this sense of disintegration consists not in forcing people into lives of misery based on the model of the nuclear family, but in reviewing the importance of the extended family, and in adapting that as a model for community life in the future.
Nevertheless, the experience of the Church as a whole has never suggested that the monastic state is somehow spiritually superior to that of married people, and the theology of the Mysteries guarantees that the path to sanctity is open to the married person and the single person alike.