Imagine that those folks might do things, perhaps involving violence. Maybe things like starting wars and such.
There's no need for violence or a war, for failure of gigantic proportions, one hacker attack is enough. We've put ourselves in a position that we have a single point of failure, and if somebody gets hold of GHash.IO resources he can break the blockchain.
Both solutions are unacceptable, I'd rather see Bitcoin fail than degrade it like that. Fortunately, we have some other options that were not there in the history. We have the source code, remember. Consensus can be reached to change it in a way to remove this threat. Core developers have to quickly reach consensus what to do.