In general, if I arbitrarily change the formula of a well known chemical reaction, the physical laws of the universe yield something OTHER than what the usual results would be. It is the same with language. That's why the Church based the formulae of the Mass on one well-known language that was the most widely known at the time, thereby ensuring that ALL priests, everywhere, would be saying the same thing, and more specifically, the mystical result would be the same. IF we had been more careful about things back then, ARAMAIC would have been the natural choice, for then we would be saying things, and they would have exactly the same meaning, as Christ said and intended, even if it would have been without His full understanding and comprehension. Latin was the next best choice, as it was spoken and written throughout most of the then "civilized" world of Western Europe. Words have power. Moving to the vernacular was bad enough - changing time-honored formulas will be much, much worse.