Almost wonder if this kind of thing will be an impetus for GNU Hurd to get more momentum. I saw an update recently that they're now finally properly supporting 64bit and sounds like there's active dev going on there again.
It apparently uses SysVInit
I've heard of Hurd, but never felt tempted to try it. That could be an interesting option.
Did they finally add USB support?
I would somewhat doubt it; the negative aspects of Mach’s design are a technical albatross around the neck of any kernel.
Apple has had to invest reams of engineering effort in mitigating Mach’s performance and security issues in XNU; systemd dissatisfaction alone seems unlikely to shift the needle towards Hurd.
Others have been reminding us of the *BSD init systems, and I remind that SysVinit is not going away from Linux while projects like Devuan and others continue. GNU Hurd is another other-than-systemd learning opportunity.