Well, I consider myself a GNOME developer and am a GNOME foundation member. That's my priority. I do not use KDE, and neither do I use LXDE or any of the other DE. Please understand that I am just one person and will not fix all desktop environments for you thank you very much. If KDE people are interested in systemd then they are very much welcome and should talk to us, and I'd be happy to work with them, but as KDE is not directly the project I am personally interested this has to come from them, I will not become a KDE hacker.
Also note that the man who currently does most of the maintenance work on PA during my hiatus working on systemd is actually a KDE contributor (Phonon), Colin Guthrie, so this worked out quite well in the end.
If KDE wants to be a leader in innovation when it comes to developing the infrastructure of the Linux desktop, then it actually has to become active and work with us. It's their duty, nor ours. So far however, with HAL/udev, NM, PA, Gst and all the other techs we pushed from the GNOME side they ended up catching up eventually, but never led development. I would be happy if they'd work more with those doing the ground work.