Koudanshi is very good about updating his files to work with XOOPS updates nearly as soon as XOOPS turns em out, & he is incredibly nice about helping with any issues that may arise with his modules.
That I do not doubt, I've spoken with Koudanshi, and he is one of the best, but if something was to happen in his family and god wish it never will happen, or if he takes a long holiday, or other unforseeable things arise, then you are still left waiting.
This would be better as the core module for XOOPS in order for support and upgrades, but then what would Koudanshi if the XOOPS dev's make it core, would he still be involved in development and even though he is an outstanding person, the Devs may not be looking for other Devs.
But I think IMHO we should stick with Newbb and if the Devs wish then work on that and upgrade it, incorperate new features.
Of course like I say this is IMO