This answer only proves what people say about the pro-systemd people's bad faith. You clearly pretend to misunderstand the point of my post.
So (I'll bite) to be clear, I wasn't saying that RHEL 7 is mandatory, or that systemd is mandatory in RHEL 7, but only that systemd hasn't been thoroughly tested in the real world yet. I'm sick of pro-systemd people harping on about systemd being mature because it's now the default in so many distros used by so many people since so many years, blah blah blah. None of the distros which ships systemd as default for more than a year is used in a serious corporate environment.
Most job offerings I see ask for RHEL/CentOS skills. Next comes Debian, then Ubuntu, and occasionally SLES. Only once in my career I had an job interview in a company which used an infrastructure based on Gentoo; but I never ever saw a job offering asking for Fedora or Arch skills, let alone OpenSUSE or Mageia.
So stop the bullshit about systemd being ready for prime time. it may be so for personnal or SOHO infrastructures, but in the real world of enterprise-grade distros, it still has to prove it's stable, secure and properly working as expected. I don't say it's not, I say it still has to be proven.