This is absolutely incorrect. We're to the point where certain software packages (GNOME comes to mind) are requiring hard dependencies on it. I was just today reading about some incompatibility that arises if your kernel is set up with no IPv6 support which is explicitly caused by systemd. (To which the response from the systemd folks was something along the lines of "You shouldn't be turning it off anyways")
(Great, now our software takes philosophical positions...)
Sure, you're "free" to use something else, in the same way that you're "free" to patch and recompile every program that touches it to stop touching it. So "free" in the FOSS sense that nobody but developers care about.
Meanwhile, in the real world, populated by end users and sysadmins, the most important people when it comes to a computing environment, the ones that all of this crap is being done for at the end of the day... not so much.
sigh
I'm annoyed that systemd is taking over for political reasons and not purely on its technical merits, and that there is no way this is not going to lead to a monoculture. There will be others, but they will be relegated to the position of marginalized, niche players that nobody outside of /g/ troll threads care about.
I'm annoyed that the rest of the world is going to have to adapt to this software, rather than the other way around.
I'm annoyed that this software is doing 5000 things where one would do.