I would suggest that the current *users* of LedgerSMB for the most part do not need EDI because if they did they would probably be using other products. However, I think that an EDI module would greatly increase our ability for businesses to find LSMB useful.
I think that what is necessary is someone to take a lead on defining how something like this would work. Since the restful WS code has not progressed as fast as we would have hoped, I am open to suggestions as to how to do this.