I'm pretty sure at least Ubuntu will keep patches to make some of such apps work without systemd. I can maintain these in community if that time comes. But I can care about KDE only, making GNOME work without systemd would be a too difficult (I don't use it and they are much more likely to require systemd than KDE). Fortunately KDE currently uses only one library (polkit) that is likely to switch to systemd in near future.
Personally I live happier without polkit but for others it may be if the build machines don't mind that arch could have kde-nosystemd packages? -- _______________________________________________________________________ 'Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface' (Doug McIlroy) _______________________________________________________________________