A VERY vocal minority do not want Systemd on ideological grounds (although I suspect it is more a matter of the new and different scares them, no matter what advantages it may offer)
"new and different" actually is a huge problem, combined with what appears to be a very atypical adoption process happening in a very short period of time (in Debian, within a single release cycle).
Now, ignore the vocal minority. There's always a vocal minority. Sometimes they're right, most times they're just loud, but in the bigger picture they're still a minority.
It's the silent majority you need to be worried about, and the silent majority don't want systemd. This has nothing to do with the technical merit of systemd. They don't want any substantial deep changes. They want small, piecemeal, trackable and revertable changes. The very conservative people who's livelihoods depend on Linux "just working" are looking at this systemd business and flat-out wondering if the distros have lost their collective minds?
My group, who are usually pretty near the bleeding edge by our corporate standards (we generally track current stable releases and and deviate from stock as little as possible) normally track Debian stable and we're seriously considering bypassing/delaying Jessie. I can't imagine selling systemd to the other parts of the organization who have deep mods to the distro and reams of detailed documentation that'll have to be completely gutted.
Basically, all this discussion is pointless noise. Watch the adoption rates for the next couple of release cycles of the more "conservative" distros who have been pulled into the systemd gravity well. Particularly adoption rates where there might be a desktop/server breakdown. That's the silent majority passing judgement. I don't think it's going to be good.