Not too worried, as long as there is "fallback" mode

The FAQ of the journal doohickey says that one can continue running syslog right next to the binary stuff. Given that, I'm personally not overly worried. Disk is cheap.

Thus far systemd has mostly worked for me and as a concept it makes sense. Maybe I'm being naive here, but that's my limited experience with it.

PS. What I don't want is a Linux system where components are not interchangeable. I think this is precisely why Linux desktop environments are doing it wrong (in some areas). Too much integration, not enough communication. Sure, integration without communication is great until the time you want that one thing ripped out and replaced with something else. Then it totally sucks.