With regard to Linux, I plan on falling behind the systemd wave in Debian, avoiding it. I may eventually move toward Gentoo, or over to one of the BSDs as well. But in avoidance of systemd, I won’t be keeping up with the latest edge of Linux for awhile, which makes for a poor developer’s environment.
So what's wrong with
systemd? Upstart is broken
by admission of it's developers, Sysvinit is solid and mature but
doesn't address the realities of the modern computing environment, and
OpenRC is cute, but...
Anyways, if enough people care about SpaceFM, it WILL be forked and development will continue, which is the beauty (or bane, your choice...) of Open Source software.
EDIT: Oh, I see, it's because udev:
https://lwn.net/Articles/490413/