I think it's a mistake to anticipate different "bloodlines" of Roughies coming in to the trade - they occur in a relatively small range in coastal vine thickets in the Kimberley, and on a couple of islands, and are difficult and very expensive to find, so any new animals coming into the trade will likely simply be duplicates of what we in the east have already. WA collectors would have to have a strong personal interest in the species to invest thousands in an expedition, or multiple expeditions, to get them into the trade in WA, and that represents a significant financial risk.
I think I remember JW telling me that each of his five animals was bred during his initial work with the species, so the original five were quite productive. They haven't been around for enough generations to be considered being "line-bred" in any way, whatever "line-bred" means anyway.
Jamie