First off: awesome post.Small Waves said:snip
Second: I wouldn't phrase the situation as "this one thing is THE problem, the other stuff isn't a problem". I would however agree that what you describe certainly is the biggest problem (though, if the "sound-demolition" stuff gets worse, i may consider it just as bad - namely when unlistenable albums (just white noise screaming at you) become the norm rather than "the tip of the iceberg".
As for autotune. I have a different take on this. I absolutely positively do hate it. But not because of arguments like "they cant sing!". Personally, i couldn't care less about if someone can sing well - what i care about is how the produced endresult sounds like. And autotune to me just sounds like soulless hollow robots - worse, it makes all those robots in the charts sound the same (i think this plays an important role in some peoples perception of this stuff sounding all the same).
I don't know for sure, but i suspect that a lot of people who complain about autotune just dislike it for those reasons: identityless robots that all sound the same - and its all over the charts. It to me wouldn't be as annoying if the robots sounded clearly different, thus giving them identity and character. It also wouldn't be as annoying if it weren't that popular, but rather just a handful of popstars doing it (there is a connection to your argument about pop as a monoculture). But both isn't the case.