I think the issue of whether packages can depend on a specific init to be pid 1 is essentially identical to whether packages can depend on a specific kernel (Linux vs FreeBSD vs Hurd) to be running.
I'm not sure what the exact Debian policy is for that, but just copying that seems to me the most natural decision. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org