When I was in University, the Semantic Web was supposed to be the future. Web 3.0. Smart agents would make appointments for us. Not so much based on AI, but based upon a structured exchange of described, semantic, data.
This article describes the current situation. What we are seeing now is a slight uptake of these concepts, promoted mostly by users slowly switching to other types of consuming data, away from the visual web, to more voice controlled. I believe initially Google’s strategy in this space was betting that AI would be able read and understand everything, but also Google is increasingly making use of Schema.org annotations, following suit of Yahoo-search (RIP).