I vote to abolish the whole thing, rules and biju both.
There is, from my perspective, simply no "fair" way to do things. If the rules are merely amended, someone is going to be upset one way or another by the changes; hosts from loss of freedom or challengers out of loss of a chance at the beast. Having the cake and eating it too has proven impossible regarding biju, because many challengers will simply choose the most difficult route possible (for one reason or another) rather than be flexible with the challenger.
If there are no rules on the system at all, and only IC rules supreme, then I don't expect to see a change of hands very often for some of the tailed beasts. I imagine village fights may once again become an inevitable way to get some of the tailed beasts exposed into a fight. I wonder if any Zenakus or Bocchieres will re-emerge prominently in such an environment.
The rules are only as enforcable as its enforcement. I have seen very few if any instances where the community punished one of its members for breaking any of the biju rules without a fuss akin to a disorderly trial. Excuses, exceptions, loophole seeking defiance and SL ways (as Uetto, Kayenta, and Warren have more than convinced me is a major problem in the implementation of any rules at this point) make enforcement difficult, inconsistent in quality, and a matter of "good guy" and "bad guy".
To put it bluntly, I don't think a "free RP" realm can handle any set of biju rules because the only rule of law universal to people here seems to be, "You go after my idea of fun and it's on, so back off". From a hindsight view, many jinchurikii worked fine under the rules, only some had issues with compliance for various reasons ranging from "I don't want to work with this challenger", "your interpretation is wrong", to "RL comes first", to "That doesn't make RP sense" to whatever under the sun. I don't think I saw blatantly, "I don't wanna fight for it" at any point, but I could be wrong, someone might could have been that bold.
I doubt my mind is going to be changed; it has been long overdue that this system be ended. Even if the tailed beasts as a whole are voided and other RP issues crop up, at least there is no need for a universal concept of "fairness" in every decision and a miniature war everytime the word biju comes up in a topic. Literally it would come down to, "Did you follow that group's RP standards?" "Did they at least give you an idea of what their standards were?" and "Just walk away and don't RP with each other".
P.S
Kayenta, not seeing the poll results until after the vote had closed was intentional, but once steam starts to slow on the thread (maybe after a week or two) or if enough people want it as such, that can be changed to show after voting instead of show after poll is expired.