As a corollary, will we see a recurrence of congestion in the middle as FttH sees increased adoption? It's easy to believe that 10 Gbps ought to be enough for everyone, but history tells us that people will find a way to saturate any unused bandwidth (8K video with crazy bitrates, 1 TB video game installs, etc).
A content delivery network (CDN) or content distribution network is a geographically distributed network of proxy servers and corresponding data centers. CDNs provide high availability and performance ("speed") through geographical distribution relative to end users, and arose in the late 1990s to alleviate the performance bottlenecks of the Internet[1][2] as it was becoming a critical medium. Since then, CDNs have grown to serve a large portion of Internet content, including text, graphics and scripts, downloadable objects (media files, software, and documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social media services.
https://en.wikipedia.org/wiki/Content_delivery_network