The simgear/flightgear/fgrun set was lacking maintenance for some time, but is now in the process of returning with a new maintainer; the problems that got it removed from testing have been fixed, but it can't be rebuilt yet because this bug makes libopenscenegraph-dev uninstallable.- fgrun is a bit neglected in Debian, [...] it's already been removed from testing for 2 years
They're sid-only because this transition stalled for long enough for its FTBFS bugs to trigger the autoremover. Is that an autoremover bug or a feature?I now see that these [reverse dependencies] packages are 'sid only',
The 99->100 soname bump is 3.2.0rc->3.2.0 not 3.2.0->3.2.1 and appears to be a standard OSG release procedure (possibly intended as a "don't use pre-releases in production" marker) rather than a real change (https://github.com/openscenegraph/osg/commits/OpenSceneGraph-3.2?page=2, scroll down to Jul 23), so I wouldn't _expect_ further breakage, but I agree it's always possible. (E.g. building with --as-needed, which you do (as recommended), is currently unreliable on ia64: #718047)Since the transition requested already mentions libopenscenegraph100, but 3.2.1 is not released, I think that it's actually more risky (or prone to more delays) if to tie the current transition to these future ones of OSG.
Furthermore, Alioth is now expected to be down for days (http://lists.debian.org/debian-infrastructure-announce/2013/11/msg00001.html), so just getting access to the 3.2.1 package might take some time.