So is language change progress or degeneration? It is neither, of course. To assert that language change is for the better or worse requires some measure of what "good" or "bad" language is, and the issue of language change needn't come into question here. But no coherent criterion has ever been given: upon examination, the pronouncements of the self-appointed pundits are always a mix of cultural biases, half-understandings of languages, and an obvious compulsion for telling people what to do.
Charles Yang, The Infinite Gift: How Children Learn and Unlearn the Languages of the World
language, linguists