Yep. You're right. Every single thread should be 15 words or less from now on. I'd bring this up in the Board Suggestions Forum, I'm sure there is a software add-in to limit the maximum number of word or characters any post can be.
Also, there should no longer be any books. If the topic of the book cannot be summarized into a magazine article, then it isn't worth reading in the first place. And, of course, it should only be a 1 page magazine article. If it is just a sidebar, all the better. Everything that needs to be said or read about any topic anywhere should be shrunk to 100 words.
[/end sarcasm]
OK, I think you can tell that I think that this a pretty terrible idea. Not every subject can be condensed. Sometimes things take more than 1 or 2 sentences to discuss. I certainly can be a long-winded as anyone, but I for one like to know as much information about a topic as possible and like to long well-written well-thought-out posts. Rather than a short incomplete post that doesn't address many of the relevant issues at all.
Overall, it takes all kinds to make a forum work. It is good to have some people who are short and straight to the point, and some people who write a lot. Different people are going to want different things, and having different people write in different ways is what makes forums great.