There's also bitrig, a fork of OpenBSD on not so friendly terms. OpenBSD lost a number of developers when that happened. They don't appear to currently support 88K, and aim to target current architectures, but I wouldn't be surprised if it'd be worth their while to support another architecture to accommodate a developer who would do all the work to maintain that platform, as well as contribute in other areas.
Keep in mind that OpenBSD is by the developers for the developers. That it's also useful for a lot of users is just a nice side effect, helpful for testing and funding.
I disagree that BSD market share is eroding. It may not be gaining as many desktop users, but it's still popular on the server side, especially on file servers due to support for ZFS, is used as the base for other operating systems like MacOS X, Juniper's JunOS, and even Playstation 4's OS. Netflix adopting FreeBSD also means a very large portion of bits being shuffled around the Internet are off FreeBSD servers.
They're not looking for a lot of smaller donators in this specific instance (although I'm sure it's appreciated), but rather one large Canadian company to foot the bill and on that company's books for accounting purposes.
"On a regular basis, we find real and serious bugs which affect all platforms, but they are incidentally made visible on one of the platforms we run, following that they are fixed. It is a harsh reality which static and dynamic analysis tools have not yet resolved.
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"Regarding shutting them down, there other social problems.
Yes, we remove about 10 of the architectures. We'd slowly lose the developers who like to work on those areas. They also work in other areas, but ... I suspect they would another BSD that supports them."