In the “Proper Pronunciation” troll, the question of the viability of Latin was not deflected.
Responding to the “Job Opportunities” thread, I mentioned that Newton’s Principia Mathematica was written in Latin. As late as the 18th century, Latin was still a living language for scholarly publications.
The use of Latin by the Roman Catholic Church is not idle. See here for an example:
http://www.vatican.va/edocs/LAT0381/_INDEX.HTM
which starts here, really:
http://www.vatican.va/holy_father/john_paul_ii/encyclicals/