Thanks for your response.
If you read the proposal https://lists.debian.org/debian-vote/2014/10/msg00001.html
that's exactly what is being voted on: to preserve the option to boot with sysvinit.
Presumably if the vote comes out in the negative, then at best, we will slowly lose this option as packages remove their init.d scripts during Jessie's life cycle.
Sent from my android device.
From: Johannes Schauer <email@example.com>
To: firstname.lastname@example.org, email@example.com
Sent: Fri, 24 Oct 2014 18:00
Subject: Re: systemd requiring Linux >= 3.7