@saper, are you interested in putting up a weblink_dead_days patch to core for review?
It looks like we wont find any regular uses of this script willing to test on Phabricator. Maybe ask for tests on the mailing list?
Anyway, for changes like this one, I would +2 based on looking at the diff and maybe some very basic testing if there is anything I wasnt very confident about. Then other users can report a bug when they use it.