I could see like on a college campus, or like a dense apartment building, but even then you'd probably use other apps, or go knock on your neighbor's door if the network is down. That said, even college campus have close circuit networks with redundancy, and we all have cell service. So a lot would have to go wrong, and again to the part where I go knock on the door of my neighbor.

I think I'm simply calling it a novelty and nothing else.