Part of the problem may be that we are fighting against a trend in genealogy (and in consumer-oriented computing in general) for "one-stop shopping" designed to lock users into ecosystems.
Example: I have a Windows computer, an Android phone, and an iPod. I suspect this is unusual because Apple has put a great deal of energy into providing an environment which is vertically-integrated.
In genealogy, Ancestry provides both a desktop product (Family Tree Maker) and the online resources of Ancestry.com. The Ancestry website is laughingly primitive when it comes to member-to-member communication, but the message inbox and member forums, ugly as they are, make it easy for people to sign up for Ancestry.com and never leave the 'walled garden'.
You can substitute 'Family Tree Builder' and 'My Heritage' and so on and the pattern repeats. Brightsolid is setting up the same scenario with FindMyPast because they are also setting up a family tree manager.
So the audience for FH&G.SE is automatically limited to the subset of users who are brave enough to actually do a search of sites like Google and find things outside of Ancestry.com or MyHeritage.com or whatever their chosen ecosystem might be.