It's not "deterioration" just change. Deterioration implies deviation from a natural, ideal, or perfect state, which languages simply do not have. This belief t

It's not "deterioration" just change. Deterioration implies deviation from a natural, ideal, or perfect state, which languages simply do not have. This belief that the language is in decline and losing some ineffable beauty or value is older than english, in fact some of our oldest historical documents at all are versions of this lament. The language we speak now is the result of millennia of such "deterioration." Those language-control bodies that some countries have are somewhat a relic of before we had our current understanding of the mechanics of language use and how languages change over time. They can also be understood as a leftover tool from the european bootstrapping-nationstates era. Either way, those bodies may (but it's debatable) have some influence on the rate the language change, or what specific changes occur. But nowhere near as much as they purport to, maybe close to none at all.