The irony of me leaving this comment on a post talking about running a witness at home resulted in you throwing a fit and berating me about it.
Yet, as you can see from most of the responses, it is in fact a big issue for most people, in fact the biggest usually (as I stated). One of the two responses that it isn't, runs both a primary and secondary on the same network, so if the Internet does go down so do both witnesses.
Either way, I disagree with your post, I have witness servers in four different countries. If one of them does get affected in the slim to none chance, I'll have another up somewhere else within the day.
The real problem is most everyone is using the same provider.
RE: Zero HIVE