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AI headphones translate multiple speakers at once, cloning their voices in 3D sound
(www.washington.edu)
This is a most excellent place for technology news and articles.
I'm with you on 1 and 2, but "reduced lingual skills" I think is a bit of a stretch. Becoming fluent in another language takes a lot of effort and people only do it if they have a good long term reason.
I think it's more likely this would cover the vacation / short term business case that is already covered by human interpreters (or apps already) instead.