While I fully understand your point, and even sympathize with it to some extent, I think that there is a more important issue at hand. Languages evolve with usage and exposure to outside influences (among other things). Compare the language of Shakespeare (or even Beowulf to go further back, which was apparently written in the English vernacular of the time) to see very obvious changes.
If we stick to a specific set of "correct" grammar and word usage, the world will eventually pass us by. The grammar that is "correct" now is probably out of date by 50 years, or at least the grammar I learned in the 70s and 80s certainly was. If we maintain this path, we'll have something as idiotic as when all church and legal documents were in Latin, and everyone spoke English/French/German or whatever.