I don't see the point in locking threads that people are active on. Plus, Neji said permanent was a no go with 80% failure rate. I would think that this event in and of itself would be likely to occur since in general kyuubi is mount. This should be like the hero's water but shortens your Forest Fights and PvP the longer you go between DK's. Even after that the water's effect should only last until a DK.
On another note, as others know there are other ways to increase chakra, it is just a not a necessary item. IMHO