We go to our parishes for the Sacraments but it is important to remember that Catholic identity starts at home, the domestica egglesia, and the home has always been the core church and Catholicism has never survived in a country in which the faith was not primarily taught and passed on in this manner.
The late Fr. John Hardon wrote about this phenomena and he was appointed to the growing Catholic Homeschooling community in the US by the Pope because of the apparent problems in the Dioceses. Perhaps what we are seeing is statistical reflection of this solid core egglesia domestica as the Diocesan Church shudders from the past decade of scandal after scandal.
I know many all over the country who travel considerable distance to attend Mass because their parish has become offensive and liberal. I know many who just travel locally from parish to parish as the Mass times fit their busy schedules. These people identify as Catholic but their parish has become the church at large for a variety of reasons. We tend to think of Church as Diocesan because of all the trappings of Diocesan and parish life but that has lost the family focus in many places. In the early primitive Church, the Eucharist was often brought into a home for safekeeping and an altar was set up. Of course we know how St. Anthony brought the Eucharist to the Desert for safekeeping, then as monastic life developed the Eucharist was kept in the Chapels. The Faith will live on but I expect Diocesan life to change back to earlier patterns from a century or two ago.
I have a question. What if you are single, and for some, have very little if no family? Then the church community becomes that extended family. I have many friends in my parish community.