In a major emergency, a landline isn't going to help you either if all police/fire/ambulance services are flooded with calls so you're still fucked.
It's to keep in touch with my other buddies on supplies, etc. They also have hard lines. I'm telling you, I went through a huge, long power outage, and the hardline was invaluable to locate supplies (can't pump gas without power) and keeping in touch. Cell phones were worthless. It's all just part of being prepared.