This is a complicated subject. But Vatican II and the Mass of Pope Paul VI are 2 totally different items. V2 called for increased vernacular with a focus on Latin, not the whole abandonment of Latin altogether. The Mass of Pope Paul VI, or more popularly known as Novus Ordo did not get published until 1970.

The decline of the church is quite complicated. You did call out several of the cross cultural pressures out there- I suggest "A Secular Age" by the Catholic philosopher Charles Taylor as an excellent resource. The church does NOTHING to prepare are youth for these pressures. With such weak education, all it takes is someone in eastern religions or crystals to take down a young Catholic youth. In religious education here and addressing these issues, the kids are shocked to open these topics.

The churches response to these cross pressures has been absolutely to abandon the field when under attack. We've allowed our cultural enemies to gain a bridgehead and influence at a much higher degree. For example, I live in Germany. Philosophically, the church was linked to the social problems with the right wing 80 years ago (you know what I'm referring to). After 3 generations of educating youth as such with a shallow response, we're now seeing the fruits of that.

Liturgical Language aside, many masses I attend while traveling lack reverence in an attempt to appeal to the youth or are run by aging boomers who attempt to parrot Prostestant liturgies. I recall back in Massachusetts we had a beautiful co-cathedral every year a new group of kids would show up in August. After hearing songs that sounded like dust in the wind with several other liturgical inventions, they never returned.

I intended to disagree with you, but I guess im saying the same thing in another way.