My opinion is nobody on this Java forum is interested, because everybody that is interested in DirectX, doesn't use java (and therefore doesn't use this forum).
Well....
I for one will feel much safer knowing there is a DX binding available for Java should I need to unlock that 35% of Windows machines (actual statistic I have measured myself over 3 years) that don't have OpenGL.
I think we'd have at least one forum member interested, and with good reasons.
35% of windows users is a lot of potential left on the table without a DX binding, a large figure which might even rise in the near future...
I'd say anyone remotely interested in using java for commercial games will be interested.