I was talking to some other admins about systemd. They are still skeptical and asked a really good question, "How do you do access control over systemd journal?"
I couldn't find any answers on the arch wiki or in the FAQ so I may have to go deep down the rabbit hole to get this one, but I will ask to see if anyone here knows first.
EDIT: I found an answer, but it doesn't look like a useful one. ACL's over the database file. http://www.freedesktop.org/software/systemd/man/systemd-journald.service.html.
The usefulness really depends on how the journal files are created. Are they created per service or per machine?
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