As the number of threads grow it is indeed more difficult to find an idea or past post lost in a thread, but the somewhat unfocussed nature of the forum is I think it's strong point. Someone elses ideas or questions or links to discovered sites help expand many of our horizons. Remember many of us have never built or owned a wood boat of any kind before. The exposure to the varied topics also are a real reason to keep active on the forum. After we're on the water and sailing the need to have construction and rigging questions answered mostly goes away. Adventures, other boat building ideas, sailing lessons, a common hobby; that's what keeps me coming back.
I also think there's the risk of dilution. In any group there is a percentage of active members, spreading that too thin may weaken the whole thing.
I say it doesn't seam to be broke; keep it as is for now.