Has a bug been filed against subversion (and other low-lying deps) yet?
(I could not see any bug and wondering why not?)

Naively it looks like the filed bugs are more targeting higher dependent packages which is less useful.
I think it is the immediate dependencies like subversion (and possibly some of their direct dependents) which need the most immediate attention.
Filing bugs against many higher dependent packages first seems a bit premature yet and creates confusion for many packagers.

I think the thread "You can't be serious! you want to remove mesa-libGL.i686 support?" summarizes the problem better,
but I wanted to make sure the problem is mentioned clearly here in this Change thread too.

Jens