Latin was not the first language used by Christians in the Mass. Aramaic and many of the vernacular languages of the patristic church were used. Greek, Hebrew, Arabic etc. were also used and replaced eventually with the Latin Mass.
Now, if the mass existed prior to the use of Latin (in which the use of Latin which greatly strengthened by the Council of Trent partly as a symbol of unity to counter the Protestant revolution) then it is reasonable to say that Latin is not necessary for the Mass, the mass does not need the language. What is the historical development that created Latin as an indispensable part of the mass…as if the language is a sacred element of the sacrifice…why has it become a necessity to the validity of any mass?
Many of the traditional catholic church traditions did not fall out of the sky, they were created through some very human process of adoption and sometimes appropriation of cultural symbols as Christianity progressed.
I know that much of the Latin traditions developed when the Constantine handed over many of the Roman empire buildings to the Church at the end of the empire’s times. And this process borrowed greatly from the Roman Empire…
Now, just because that cultural expression has become tradition, why are we limited to both Latin symbolism and Latin language arising from the Roman empire days?