We discussed it recently with Kay. We will split out a systemd-libs subpackage to be more multilib-friendly. That said, we are not aware of any specific issues with having both systemd.{x86_64,i686} installed.
Just to elaborate: The issues I was referring to happened during a F16->rawhide upgrade last December, when mistakenly doing yum upgrade instead of distro-sync. I don't recall the specific symptoms, and didn't investigate further since they went away with a yum erase --remove-leaves systemd.i686. However, they might also have been caused by one of systemd's dependencies.
Anyway, thanks for the clarifications.
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