AFAIK STT is still very bad without speaker-specific fine-tuning, so it's not going to be a literal babelfish (translating in the ear of the receiver), but it could make you speak many languages.
Your interlocutor's earpiece could beam yours a delta for a finetuned model of their voice before they open their mouth. Except not compatible across iMessage users and whatsapp users or some other predictable silicon valley negative sum power play like that.
