> Is it fair to say that there is no way of setting up Rockbox to allow these headphones to work.
There is currently no support for that type of thing in rockbox, afaik (so no, you can't just flip a switch or anything).
> Will Rockbox ever be able to support headphones that utilize such an ipod bluetooth dongle.
If someone implements it, then yes. Since rockbox is done by volunteers on their own time, it is difficult to estimate when that might happen (or even if it will).
Edit: I should mention that I don't have any first hand experience with this particular device. If I understand correctly, devices which only use audio-out and charging capabilities of the ipod may work. More information can be found here:
http://www.rockbox.org/twiki/bin/view/Main/IpodAccessories