I think you're possibly confused about what JNI is or what the discussion is about.

JNI needs binary blobs. The new FFI won't. So we will not need binary bobs when we get the new FFI.

See?

... which is why we want to use FFI instead ;-) Now you already can using JNA though. JNI still requires you to write native code and compile it for your target platform, FFI eliminates that need.