I know that some parts of theoretical computer science are on-topic here. There is now a Stack Exchange site dedicated to computer science. While this does not affect the scope of Math.SE, it might affect the fate of borderline questions.
I know that part of the Math.SE community is adamantly against migrating any question to CS.SE. Hence I have refrained from flagging any question that I thought would have a better home on CS.SE (even though I disagree about the on-topic nature of some questions — for example, I think that recursion theory is on-topic here and shouldn't be migrated, but many algorithms questions are off-topic here and would have a better audience on CS.SE).
There are currently 64 unanswered questions in the
computer-science tag, and probably a few more in related tags. Should some of these questions get a second chance on CS.SE?
On a related note, are there any old questions that were tolerated here for lack of a better home, but should now be migrated?