Steven, our friend David misstates what Sacrosanctum Concilium tells us (which is very telling of what his agenda really is).  Right after his quote about preserving the Latin language (which it has been in official Vatican communications of all kinds), SC says "But since the use of the mother tongue [note: vernacular] whether in the Mass, the administration of the sacraments, or other parts of the liturgy, may frequently be of great advantage to the people, the limits of its employment may be extended." (SC, para. 36..2)  It goes on, in the next paragraph, to grant to the diocesan bishop the right to determine the further use of the local language.  So David L. is arguing against ecclesial authority (as did Pope John Paul II in his re-centralization of power) that made the laity what Vatican II was aggressively clear about: to make ALL of the Faithful: that by reason of our common baptism, the liturgy is required to include the "full and active participation by all the people."