As an aside, when I was in college, my pastor told me that they no longer required Latin in many seminaries, including the one he went to. As such, there are many pastors out there (especially diocesan priests) who have very little, if any, knowledge of Latin. I would suspect that this, in and of itself, would be a huge stumbling block.
Regardless, the use of Latin was a changeable discipline, and only held for the Latin Rite. In this respect, it is similar to the requirement for priests in the Latin Rite to be celibate. As for “vernacular” being the “fruit of the Reformation”, IIRC, there were calls well before the “Reformation” for the Mass to be said in the vernacular. In addition, such claims could also be made for non-clerical studying of the Bible. It was discouraged before Vatican II because “only the Church can interpret the Bible”, which remains true.