Working on a community web site can be rewarding. But it can also spiral out of control in a hurry. Well-meaning people (and those not so) empowered with tools to instantly reach a large audience on their own will still need guidance and support. As much as we'd like to believe that WordPress and all the rest make our lives as devs easier, it often is just the opposite. Yes, it's easy to update JUST ONE CLICK! but when that update causes a plugin to misbehave and OOPS WHITE SCREEN...you see the problem?
If you build a site like this -- especially volunteers -- then be prepared to support it indefinitely. You're name is going to be called whether to cast blame or beg for help. It's best to be there from the start to avoid both instances.