I have to admit, I'm not entirely sure why there's so much hate for reliable technologies like landlines. All I can guess is that they stole someone's lunch money. Or people feel the need to justify their cellphone purchases by coming up with specious arguments against the "competition".
1) Not all disasters can be evacuated away from. Tornadoes, for example.
2) So do power poles. And those telephone poles are also probably carrying data.
3) You can't dial 911 via email.
Cell network congestion is a well known phenomenon when disasters strike. It's been seen multiple times in the past. Yes, landlines can and do fail as well, but they're more resilient than cellphone networks.
Perhaps this will flip in the future, but it hasn't, not yet.