My main concern with seperating them out is that there are many "pet" or BYB bred dogs that carry the white gene and could produce white puppies from colored parents. Would they be regitered as GSD's or BBS's?
I'll try to explain it the best I can.
AWSA has never asked the GSDCA to change the breed standard or to remove whites from the GSD breed. They wanted the GSDCA to indicate to the AKC that they (GSDCA) would not protest the AKC establishing the White Shehperd as a separate breed within the FSS program. White dogs would be voluntarily reclassified at the discretion of their owners. Only the dogs entered into the FSS and their future progeny would be registered as WS in the FSS.
This group could include AWSA dogs, (now registered with the AKC as GSD's and in the AWSA registry) imported BBS and UKC WS's, if I understand it correctly. People who wanted their white dogs to stay part of the GSD breed would have nothing to do with the process and their dogs wouldn't be affected. Those dogs would continue to be registered as GSD's.
The final outcome, which could take years, would be a distinct breed of dog in the AKC called the WS (or whatever name they finally decide on) The white coated GSD would still exist, just as they exist now alongside the BBS in parts of Europe, as two different breeds of dog.
The only thing that could change and possibly hurt the white GSD breeders who favor staying with the breed is that the GSDCA could decide in the future to change the standard and remove whites from the breed. If that was done after the WS had been recognized by the AKC and after the stud books were closed, all future white coated dogs born to GSD's could not be registered. They would be in the same position as the whites that were born to dogs in the SV. The GSDCA has given no indication that they plan to change the standard.
(don't want to start rumors, just throwing out all possibilities)