I'd like to suggest the deprecation (removal) of the Blender, 3DS Max and Maya JSON exporters for two reasons:

• The exporters are not really actively maintained. There is a long list of non-trivial bugs, feature request and suggestions no one cares about (see the Blender issue list). Because all exporters are based on different APIs (Blender, 3DS Max...) and written in different programming languages (not JavaScript), it's very hard to maintain this stuff.
• The more important point is that the quality and maturity of certain loaders (e.g. FBXLoader and GLTFLoader) were greatly improved over time. In other words, it is much more likely to load FBX or glTF files with proper results. Besides, these loaders are actively maintained by project collaborators.

So instead of exporting to the JSON format, users should focus on other formats like FBX or glTF. And in context of asset delivery, especially glTF is a much better format than (uncompressed) JSON.