The diminution of parishes - on the part of the laity - is the evolving sense of community. One can opine that it is in decline or that current realizations no longer meet the need.
On the part of the institution, it is the realization in practice that the Church uses the word "community" but either does not understands it; doesn't believe in its own rhetoric, ie is hypocritical; or both. 
Closing churches; consolidating, amalgamating parishes is the "earthly" response to an economic model of institution. It is only conceivable in "the companionship of the followers of Jesus", if it is moving into a conscious, elevated and more contemporary relevance of the meaning. 
The sense of Pope Francis and of our communities of religious women of our essential interelatedness with each other and with creation is a microscopic beginning....