Again, welcome to the joys of the IndieWeb. I, too, share your concerns about the long-term viability of community oriented projects like Known, Brid.gy, etc. I've recently heard it suggested that perhaps IndieWeb work should be managed under the umbrella of a foundation, which is supported by active community members and corporate sponsors.
The other encouraging note is that commercial endeavors are popping up that support IndieWeb specs and share similar philosophies. Notably, I like what I'm seeing from Micro.blog.