Well, at SIGGRAPH the format was getting some traction, yes. The industry is of course really interested in THAT format that will be "universal". Note that it was the idea of Collada too, but they failed because the format was too complex and specs were not specific enough about the implementation.
This format is different. It's been made with state of the art techniques in mind, and provides an extensibility mechanism.
Most of all it's a REAL open format. Not like openGex, that everybody already forgot about. It's backed by the Khronos group (though collada too... but they learned from their mistakes).
That said, If in the end this format only provides a bullet proof Blender to JME pipeline, and that nobody else uses it... I'll be absolutely satisfied with it.
Now for the bigger plan. Sketchfab is now automatically generating a gltf export of any of it's downloadable model. Meaning that if we support gltf, we have a direct Sketchfab -> JME pipeline too. We always wanted an asset platform...let's use Sketchfab.
I work for Sketchfab now, so it may seems that I am working for my own interest. But if this can help the JME community... well I won't have second thoughts.
Also... I would bet that other asset platforms, like unity store will take the step and also generate a gltf version of their assets pretty soon. But that is my own opinion of the situation.
A standard format benefit every one, and the industry is starting to believe in glTF.