better than WANE-TV one night when the fiber that feeds their network programming failed and they sat in a green screen (the fiber receiver makes a green screen when there's no program video) for a while and then a logo slate. Mega fail. Nobody could figure out how to put something else on... this was a few years ago, now I think they have an emergency plan.
The best situation has a plan in place to at least go to a patch panel and bypass the automation...granted you have SOMEBODY in house that knows where to patch in a tape deck or the production switcher. The system I helped put in at GPTV in Atlanta GA had a patch FOR EVERY SINGLE SOURCE coming in (tape decks, sat. receivers, audio boards) and going out. If there was trouble they had a work-around. Not hard to engineer into a system, it JUST TAKES MONEY. Big Picture Broadcasting.