See it this way: we have to know what the bad guys are saying in order to be able to protect the public. The way I see it the US government (and governments around the world) will make this a non-negotiable objective. There's not a lot of pressure now because, as Barr said, the event that will turn the public against encryption hasn't arrived yet. If the parties involved don't find a solution in the meantime they'd be forced to weaken encryption for everyone when a catastrophe happens. The public is fickle. Our safety is paramount.