Interesting idea! However it will be very expensive to store all of this on a CDN.
The problem is users will interact with a majority of (get) APIs through a CDN and as developers we should reduce unnecessary data sitting in the CDN because it costs quite alot of money to serve.
For example if a CDN is returning JSON data {name: “Bart”} were only paying for 50 bytes or so of data transfer. BUT if instead we convert this to HTML and serve it, we would be 10x (or more)the data stored on the CDN to serve that data.
I don’t see a strong argument for paying 10x more to serve data as HTML.