My take on all this
Systemd looks set to bring me problems I don't need to solve problems I don't have.
It intends to replace all manner of things that have been working well for a long time for no more apparent reason that its authors want to. What's more, when I read things such as the claim that the new udevd can be installed without systemd, it just can't be built on its own I realise that, whether by conspiracy or cock-up, the source code is clearly a hairball. That's one black mark. The fact that at least one of their developers have been on the receiving and of a bawling out by Linus on code quality underlines that. (And really Linus's bawlings out don't seem to be all that frequent, just highly publicised.)
The notion that the standard logging is binary is another black mark. It's akin to shipping binaries without source; I'm amazed the whole FOSS community hasn't descended on them for that. Maybe they've escaped on the basis that they allow additional text logging. I'd have to trust them that if, one day, that should happen to break, they'll fix it but I'd have to check their history of responding to bugs.
Then there's the position on start-up scripts. I know there seems to be a fashionable aversion for scripting languages invented longer ago than the day before yesterday. Nevertheless anyone who is administering serious Unix-type systems should have some familiarity with shell scripting. It allows arbitrarily complex operations to be performed, .ini style languages not so much. Again, we are allowed, at present, to use scripts in addition to the default .ini approach. For how long? Until there's no going back?
With Debian falling in line I fear there will be little to inhibit devs for all manner of stuff simply assuming that systemd will be there and including it or one of its relatives as a dependency. It will gradually become more and more work to maintain a non-systemd fork. In short, I think the Devuan fork is built on optimism and will become unsustainable on a voluntary basis within a Linux ecosystem within a few years.
Red Hat may be able to sustain their pre-systemd distro for a good while on a commercial basis. Alternatively, having seen off the last major non-systemd competitor in the server world, they'll be able to discontinue it any time they like once their contractual obligations expire.
In the meantime, it looks like many of us will be switching to BSD.