The fact we won’t be shipping logs into the same location won’t break any software. They will stop observing new logs on disk, which is the obvious and intended consequence of disabling or removing such a service. We should of course publicly inform people that this is being done and why (in addition to this thread), but I see that change as a very positive one considering it will prevent wearing solid state devices out, and will also prevent unattended systems from crashing due to disks full of logs. That Ubuntu thread that reached an agreement on doing this exact change also seems to back this as a good choice. The point made above about there being almost no users of this interface is an excellent data point as well.
So, my vote for us to move on and remove rsyslog from core altogether, and then start working on a syslog snap, preferably together with someone that in fact depends on this feature instead of someone that would just develop it on a theoretical basis.