This ignores the fact that people and companies adapt. I'm sure the 911 service won't just hope things don't fail; for example, I cluster the servers that handle 911 dialing on our campus because I don't "hope they won't fail." It's like in the 70s when people thought we'd be out of gas by 1996. They forgot to consider that people make adjustments as the world around them changes. We have more gas now than ever. Same with bandwidth.