We use JSON Schema, and we have had nary a problem with storing a bunch of JSON documents in a variety of no-SQL databases for many years now (knock on wood because yikes that a bold sentence to write).
Making sure there aren't major breakages from one version to the next sure would be nice, yes. We hit some snags as we attempted to upgrade from I believe 4 to 7, especially because we'd have to deploy native apps into the wild to use the newer version, and getting native mobile apps deployed everywhere quickly is an exercise in futility.
So being able to be confident that draft X will work with draft X+1 would be pretty excellent.
Making sure there aren't major breakages from one version to the next sure would be nice, yes. We hit some snags as we attempted to upgrade from I believe 4 to 7, especially because we'd have to deploy native apps into the wild to use the newer version, and getting native mobile apps deployed everywhere quickly is an exercise in futility.
So being able to be confident that draft X will work with draft X+1 would be pretty excellent.