I think all the assumptions are valid IF we make the the community website something worth coming back to. So we as the TSCN ISE professionals must not only build the platform, but also make the content and information flow robust enough that it engenders frequent visits and even a necessary tool. Here we can take much from the digital learning body of pedaogogy and praxis.
I think all the benefits makes it worth the effort. The downside risk is that we make a white elephant website, which as things go is not incredibly terrible.