the purpose of the liturgical changes which allowed Mass to be celebrated in vernacular languages was to allow people to hear the fullness of the proclamation of God’s Word and preaching and interpretation of that Word. the original impetus, which began long before V2 (history of liturgical renewal is done to death on other threads), was to serve mission territories and validate what many missionaries had already found to be most effective, going back to Cyril & Methodius, Jesuits in Asia etc. (The RCIA developed for the same reason).
America of all places, where prit near everybody, at least in larger cities, has grown up in an ethnically mixed environment, should be receptive of this idea. We have already fought these battles - Italian parishes vs. Irish pastors, German pastors vs. Irish immigrants. The American Catholic church developed in response to the needs of each wave of immigrants. The official public language of the State of Ohio was German, almost up until WW1, and the huge influx of Irish immigrants coming in first to build the canals, then railroads, then steel mills in the 19th c. posed a challlenge to the mainly German speaking pastoral hierarchy. So it has gone all through our history.
there has always been a balance, more or less uneasy, more or less workable between ethnic and “generic” parishes, and between ethnic groups in the same parish.
get back to fundamentals. V2 and the bishops speaking together with the pope have mandated that whenever possible, and without setting up roadblocks, the people hear the Word proclaimed in their own language. get with the program and quit bitchin’
If you are in the fortunate position of being graced with a growing presence of Hispanic Catholics in your parish, get down on your knees and thank God, and do you job as a parish and serve their needs. They will be the saving and renewal of the Catholic Church in this country, which in many places functions as little more than a country club. Welcome them, and be prepared to meet a faith with power and depth you may never have seen before.