My earliest motivation stemmed from a desire to know statistical information about my own posts. I felt that if I could know, for example, that 65% of my posts involved hardware questions; or that 90% of my first responses were to provide information from the wiki or www.google.com/linux; or what were the average number of posts per solved thread; or, how many threads that I participated in were solved...etc...etc...
Also, to improve my abilities in helping others here, it would be useful to know similar statistics about the forum as a whole (or at least the beginner forum which is where I tend to respond to posts). Further, I'm planning on contributing to editing some of the numerous wikis that need editing; it would be nice to try and fix those in order of priority. Or, write a howto when I can see that it is sorely needed.
So those were my personal motivations. However, what I meant by "unify" was not that the forum should be the sole source of documentation--to me that is absurd. What I am saying is that every single resource that Ubuntu has should be easily accessible by all the others. When it comes to solving problems this means having a search engine that could equally find related solved posts, related howtos, and anything else related.. (I need to know more about what all the resources even are--see my point ). It is not that documentation is created entirely based on forum posts. It is that the documenation considers all helpful information, which of course would include "solved posts".
The key to all of this is providing meta-data to all documents (including threads and their corresponding posts) so that they can easily be searched or analysed for any number of useful purposes. The exact forms of utilizing that information (bot, unified search engine, individual uses, whatever) are secondary; since, without the meta-data none of it is practically possible.