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I don’t think the vast majority of games which could make use of AI Voice have the sort of accessibility features to be played by those individuals even if they could hear the dialogue. It’s such a rare occurrence for a blind person to beat halo or an RPG that news articles get written about the examples.
What about partially sighted or dyslexic individuals? Sure, a game like halo would need a lot of modification to be fully blind accessible, but a visual novel, for instance, might not. In my experience most visual novels are built as passion projects on shoestring budgets.
Lots of existing games have robotic narrators already (e.g minecraft), they just speak with a monotone voice. By incorporating more advance machine learning capabilities the same narrator could be capable of outputting a more nuanced and pleasant delivery for those that need it.