What you class as a business necessity does not apply to all. A bulletin board is not intended to be a C.M.S or a bug/issue tracker. Why consider evolving the base into something that is for a certain niche requirement? The company themselves should design their own system around the core, or hire someone to do that work, unless an extension already exists to fulfil that need.
Also, saying that a bulletin board has minimal business use is just plain false.
Thanks for your comments.
My perception is that the market is flush with forum systems. Of course there are many sites which run pure forums, but many organizations and businesses already have some type of need to have user accounts. Integration can be provided by external authentication (which I have contributed -- see http://punbb.informer.com/forums/topic/20436/ )
But sites that have paying customers or members, typically have a major need for communicating with those people. Similarly, many projects, including Pun, need ways to track bugs. Existing bug trackers (including Trac) are very focused on the bug and the tracking, and are poor at discussion.
Thus, it is my suggestion that a strong long-term direction for Pun is to steer towards a hybrid that includes tracking. I think that opens a new market of users and customers for Pun.
As for myself, I don't care. I need a forum today, and have switched to bbPress. So you can take my comments with a grain of salt -- they are just some comments about what I think will make Pun remain relevant in the future.
Michael