No doubt that established forum communities will continue because they're established as communities, but in recent years I've discovered that an increasing number of forum owners actually put a lot of effort/expense into forum visibility and still wind up with meager activity. What has amazed me particularly this year is that post exchanges are deemed to be essential, and even pay-for-posting is done. If you have to pay people to post, pay for advertising, you don't have a community, really. What you have is a dinosaur on artificial life-support that puts a big hole in your pocket. Big existing forums will either stay big or get bigger because of the established community it already enjoys--new boards have been increasingly unviable without the ability to import an existing community even if it is just your friends, neighbors, schoolmates. What I've learned is that you can't throw money at a forum with no community and expect it to grow. All you get is just a moneypit.