We shouldn't do away with the forum. It costs us nothing and gives a central location for people to potentially connect without having to be on Facebook or some other social site. Unfortunately, most of any activity is happening on those social sites. Generally the WA chapters have been pretty quiet though. We had a good run in early 2011, but it dropped off again. Seems that it has gone up and down several times.
The reality is that it takes quite a few people to create enough 'critical mass' in conversations and keep things going. I personally would prefer that we move everything to Facebook, just because people actually check it daily. That being said, a number of people are categorically opposed to FB, so we will keep this up. Obviously people don't visit it as often or see posts though.
Ultimately the problem with TZM is that it's more about a mentality shift and spreading information right now than it is about activities. That often makes conversations on the forums feel like 'preaching to the choir' without any specific goal. My suggestion would be to come up with some ideas for more creative oriented and internet projects that can be simultaneously fun and spread information... instead of setting up 'meetings'. That being said, the Seattle group has been pretty active on its Meetup.com group -- here's a link if you want to check it out. There is actually a chapter meeting tonight too.