Your last sentence sums it up. This is what users want.

The main killer app, I think, boils down really expensive speech-to-text (and vice versa) with a reasonable number of seemingly authoritative querying details in fairly plain language. It's a new, 'better' search engine, just with different pitfalls people need to get up to speed on. And that may be enough, because employing humans to fill the same role as effectively is more expensive still.