I imagine language with some new tags.
Tags like "original source" and "number of iterations from original source"
("Iterations" probably isn't the right term. If Bob saw it, then Bob told Sally, then Sally told Frank. Frank has "3rd iteration" knowledge. But what's the better term?)
I'm talking about any statement about reality. All by itself. With no knowledge about the person who said it.
I think that the guy who saw it and the guy who heard it tenth-hand get equal weight, because we have no way of telling the difference.
So maybe we should have a way to tell the difference.