On: Google+ for consumers will shut down on April 2nd

But who watches the watchers? It would be supremely ironic if such a service shut down.

You're right. It seems as though the service (perhaps every critical service) has to open source their code, let you self host, and then offer their own hosted version for a price.

Yeah, that makes sense to me. I'm not sure how profitable that can be, but it'd certainly be ethical and useful to people. I do think it'd be sustainable at least.