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Yes, that would be an accurate TLDR.
It seems to me that nobody has really engaged with what you've said here yet, because you've said a lot. To summarize as simply as possible, this is what I think you're saying: 
1) Human flourishing has improved a lot in the past, and
2) We're at the beginning of a downward trajectory that only seems to be accelerating. 
Does that sum it up well to start, at least in a like very TL;DR way?