I think the poster is not seeing the forest for the trees. BSD has no real use case except as a way to subsidize giant megacorp development with volunteer work.
Linux, for all its warts, is superior to BSD in nearly every way that matters to application developers and to companies who need a server OS. The areas in which BSD is superior to Linux simply aren't important enough to justify using BSD, unless you are a corporate parasite like Sony and need an operating system with a parasitism-enabling license but don't want to pay for more than a handful of developers.
The market just doesn't seem big enough to support Linux and a handful of BSDs, and at the end of the day that's the real reason why BSD appears to be dying, because there's no reason to reach for BSD when Debian and Slackware exist.
Linux, for all its warts, is superior to BSD in nearly every way that matters to application developers and to companies who need a server OS. The areas in which BSD is superior to Linux simply aren't important enough to justify using BSD, unless you are a corporate parasite like Sony and need an operating system with a parasitism-enabling license but don't want to pay for more than a handful of developers.
The market just doesn't seem big enough to support Linux and a handful of BSDs, and at the end of the day that's the real reason why BSD appears to be dying, because there's no reason to reach for BSD when Debian and Slackware exist.