Nice lecture! Cherokee (Tsalagi) was also a constructed written language (both versions; the version developed by Sequoya (aka George Gist) and the later version adapted to be easier to print from Latin fonts). The Vai syllabary in Liberia, Africa is another example.
Regarding the loss incurred to humanity as a whole when a language is lost, I would recommend Suzette Haden Elgin's The Language Imperative. You may or may not agree with her points and conclusions, but I think she covers the topic well.
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