I blogged a range of disaster scenarios a few years ago:
http://davidgerard.co.uk/notes/2007/04/10/disaster-recovery-planning/
The WMF looked a lot less solid then than it does now.
At least we have a full history dump from en: now. Probably.
Can we reasonably say that everything else on the list there is a solved problem we don't have to worry about?
- d.