Lots of truth in your post, MurphE . . . here's a problem though, and I say this as someone who has had to teach Latin, informally, to a number of young guys who want to be able to pray in Latin . . .
The crisis in the liturgical language of the Church is tied into the crisis in the ENGLISH language in our schools.
What I mean is, when we went to school (yes, I know, when dinosaurs roamed the earth and nuns wore the habit), we were taught what I, as an educator, consider to be the most basic foundation for learning Latin (or any other language beside one's first language): how to diagram sentences.
By which I mean not only how to diagram sentences but, necessarily, the grammatical rules that such diagrams demand, pre-suppose, and in their own way teach!
To move from six years of diagram work with English into 9th grade Latin was a breeze for me - and for so many others in my age group.
Some of these poor young guys who want to be able to say Mass in Latin BARELY KNOW ENGLISH.
But be that as it may, what a tragedy that they could go through the entire pre-ordination theology graduate school and never have to take even a basic course in Latin (oh, but make sure they get Biblical Greek and Hebrew)!
Where to begin?
As you note, however, the problem is they don't know any grammar. When my sister taught beginning French (as a grad student to undergrads), she found she had to explain -- in English -- the very concept of nouns, verbs, adjectives, adverbs, clauses, etc. before she could explain the French grammer.
Catholic seminaries are teaching Biblical Greek and Hebrew? To people who know no grammar? New one on me!