True but i do see a general shift to "types are good" so there is a shift to "schemas are good" by extension IMO.

The big thing is JSON has common basic building blocks (simple types) so you are unlikely to see the same class of interop problems like SOAP and friends had ... "oh look this defines a new type my Python soap / xml lib doesnt natively support" (happened to me a few times, most memorable was akamai soap api using a custom list-of-string type nothing in python would parse out of the box)