systemd offers great features but they all come as a part of the same giant ball of mud. Look at what happened to udev. In 2012 the udev codebase was added to the systemd source tree. At the time it was promised that using udev separately would continue to be supported[1]. Once kdbus is merged into the kernel using udev without systemd will amount to implementing a separate userspace kdbus[2]. This is happening with the release of 3.17 this year.

Nothing will be broken out. systemd is a blackhole. Nothing escapes. systemd is good and useful but the trend here is clear.

[1] http://article.gmane.org/gmane.linux.hotplug.devel/17392 [2] http://www.phoronix.com/scan.php?page=news_item&px=MTczNjI