But English, while a local vernacular, is local on 3 continents --- the British Isles, Canada, USA, Australia, NZ, and many ex-British-Empire places --- and the best and most widespread "second" language almost everywhere, on all 6 inhabited continents. That has its advantages, too.
I am by no means a philologist, but I don't think that any language that's in use is ever immutable. Just look at the difference between Classical Greek, Koine Greek, Modern Greek.
Used to be, Greek was the language of drama, poetry, philosophy, theology, mathematics and the sciences -- high civilization --- while Latin was the language of cops, soldiers, construction workers, publicans and petty bureaucrats. That's one connotation of Jerome's Latin version being "Vulgate" --- common --- and the Greeks thought it was a damned shame.
'Course, before them, the rabbis of Yavne thought Greek was a damned shame!
Would seem the common language of the World is becoming/has become English...Would it not be naive to think that God does not have a hand in this???
Perhaps the Catholic religion should just let go of the old, dead Latin just as it one time let go of the old, dead Greek...