Now that I'm old-and-grayer (though still aspiring to be a 90-year-old teenybopper), I claim the privilege of complaining about how much better things were in the olden days.
What I've noticed is a decline in clarity/accuracy of speech/language - not just pronunciation, but also enunciation, spelling, grammar, punctuation, and vocabulary (obviously not a problem on this forum). There were reasons for all those rules - it allowed people to communicate more accurately and to get their message across with less confusion. My backward-looking glasses aren't rosy enough for me to claim that everyone was, or even most people were, perfect in their speaking/writing, but teachers really did try to correct errors, and educated people were expected to speak and write "properly". It was relatively rare that newscasters made grammatical errors, and very very rare that there were such errors in books and magazines - copy editing and proofreading were the norm then. People seem to communicate in much more vague and less precise ways now - I've seen a lot of really bad memos and staff evaluations, where it is hard to tell what the person means or is trying to say. And this was true even before the Great Demon Texting arrived.
I assume the US is not alone in this.