Here as in many other documents, Vatican II called for more responsibility to be given to national and regional bishops' conferences.

Sadly, that responsibility was short-lived:

The Vatican under Pope John Paul II emasculated national episcopal conferences, the principle countervailing forces against Vatican centralization of authority. After a 1998 edict, the conferences could only speak out authoritatively on matters of faith and morals if they did so with unanimous consent, which is impossible to get.
(In Abusive Ecclesiastical Authority by Thomas Fox)

John Paul II and Benedict XVI deconstructed teaching authorities such as national Episcopal conferences
(In The Year of Faith by David Timbs

John Paul II's 1998 letter 

^{Jesus, may bishops' conferences soon recover
the responsibility given them by Vatican II !}