Systemd is coming a linux distro near you.
In fact, if you're using RHEL 7+, CentOS 7+, Fedora 15+ or Arch, you're already using systemd. You can always stick to a distribution that stays clear of systemd, but chances are you'll eventually run into systemd -- so we may as well learn to get along with it.
Here's a set of resources I found useful.
Read more at Mattias Geniar's blog.