The idea behind FBX is that we can potentially load things from asset stores directly without requiring the user to figure out a whole other tool suite just to do the conversion. (Blender’s Ogre exporter is not exactly user-friendly if you’ve never used Blender before… and even then…)
I don’t think there are plans to remove ogre support but I guess the question is how much longer that exporter will be maintained by the blender community. Last I looked it seemed to be moved into some kind of “unofficially supported” status or something. I know I had to go somewhere weird to get a version that worked with my Blender install or something.
Edit: in the mean time, you might want to keep an eye on xbuf and potentially test it occasionally (or offer some test models if you find issues). To me, that seems like the best hope for a fluid Blender to JME asset pipeline. Xbuf format – A developer friendly game exchange format for 3d data