It’s not postmodern, it’s understanding reality. Language evolves, language has always evolved, language WILL always evolve. Just because somebody wrote a prescriptive people think that’s forever. It isn’t. Language is still going to evolve, maybe a little slower because now there’s a book teachers can point to, but it still will happen. People change, societies change, languages change. Sometimes for the better, sometimes not, but change is inevitable. And complaining about it just says you’re stuck in the past, that you have failed to keep up.
Illiteracy is not a stage in linguistic evolution. Illiteracy is devolution. It has always been around. The politically incorrect truth is that standards have slipped because in these days of democracy and equality, the bottom rail’s on top. People who know better are shoved aside, or else shamed into casting away the culture and refinement that would have distinguished them in a better age. This flatters the ignorant mob, which loves to imagine it’s in charge.
It is postmodern, and claiming that language “evolves” hardly settles the matter. Yes, language changes, and many of the changes represent intellectual and social degeneration. Ebonics, for example.
Hope you enjoy the “change”.