I don't think voiding them will solve much. Very little actually because the way I see it; it will be just the same old same old. There will rise a group of people (like me admittingly) who will just RP with those who still want the Bijuu in play. Those who don't want them will simply ignore us and vice versa on that specific matter, but it will come to when our RPs will butt heads and a forum topic will be made that won't solve anything...
Well, if you know how to actually ignore people, then at no point will the RP's butt heads. You don't ignore people by RPing with them. If a forum topic is made about something like that (Neji forbid a site-wide RP war, unlikely to occur I might add, where many parties are "forced" to RP with each other in order to wage the war) then the majority of the RP rules on that one. If most of the people in that RP void biju, no biju, and vice versa. Not pleased with that result? Leave the RP.
There is no reason for a forum topic to be made, because when those RP's clash, there are some pretty options:
A) Biju don't exist, biju party cannot use biju power, end of story
B) Stop RPing with each other if you can't settle on a middle ground. End of story.
There would no longer be any public commodities, so there would be no reason to force a compromise if the parties are unwilling.
... Its putting a band-aid on a wound that needs disinfectant.
It is usually frowned upon to disinfect players, and though I would recommend Bleach, that would probably kill the site and get SL moderators on the warpath. Just sayin', one player's fun is another's misery, though a trusted judge between parties that mediates all disputes might be a good stitch.