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I'm honestly surprised to learn that anyone defends learning Latin outside of academic scholarship. I guess I feel the same about Greek but no one learns that in the US so it's less argued about. I took Latin in high school and felt that I wasted four years I could have spent learning (rudimentary) Spanish, or at least something that had any cultural relevance at all. You have to find a way to make kids care about it…
On a day to day basis, the average American is simply actually a lot likelier to encounter Latin biological nomenclature or legal or religious terminology than, say, a fluent conversation in German. The United States is largely monolingual in English for a thousand miles, and the language ideology here causes immigrants to want their children to shift to English monolingualism as quickly as possible. And thus bad Lat…
I've visited Mexico with my Spanish-speaking wife (semi-natively) and while the locals loved to hear her speak their language, we communicated mostly in English if we wanted to be easily understood.
The struggle is real for Americans, or for native English speakers as a whole. For Americans, there is no other language spoken for thousands of miles like you mentioned (Mexico and Quebec (to a limited extent)), and even then, most of the people we interact with on vacation will speak English.
I put serious effort into maintain my German, and she puts serious effort into maintaining her Spanish. But we rarely have the chance to actually use it, even if we're in a country that speaks the language. English has won.