I agree that there would be huge gains from finding ways for us to better aggregate the info we all have and are capable of collecting. Before there was a world wide web, I worked with the Xanadu project because I found hope in their vision that back-links would cure bad debate by making it easy to find good rebuttals of bad arguments. When I came to doubt that vision, I pursued prediction markets as a more reliable mechanism by which people of good will could come together to form reliable consensus that non-experts could trust. I've been pursuing that for twenty five years.
But I've come to realize that there is actually relatively little demand for institutions or mechanisms that can cheaply produce accurate estimates. Beliefs often serve many other functions for most people that conflict with accuracy. So they aren't very interested in following back-links to good rebuttals of bad arguments, and they aren't very interested in supporting prediction markets. They also would not be very interested in buying or listening to AIs that provide accurate beliefs. The key problem here is the demand, not the supply. We have babel because that's mostly what people want.
I have hopes that prediction markets could someday become like accounting. In a world where no firm does accounting, it would be problematic to propose it, as you'd be accusing someone of stealing. But in a world where all firms do accounting, it would be problematic to propose not doing it, as you seem to be asking for permission to steal. Similarly, if we can ever make prediction markets the norm, it would be embarrassing to not have a prediction market on a topic, as that would suggest you don't really want to know the truth. Of course people don't usually want the truth, but they also don't like to admit that publicly.