Landlines still rule in our neighborhood
I live in Michigan, and there's practically zero coverage at my house; if I go outside I can MAYBE get a call through. Texts take up to 2 hours to get through inside the house (15 seconds if I'm in town, 4 miles away). There are large areas of Michigan with little to no coverage, and the same goes for many other areas of the US. It's easy to forget that if you live in a city and travel to other cities. There are also a lot of areas where you can't get broadband, either (except via satellite which is not a great option IMO).
We still have a landline, and the way things are looking, we will for a good long while yet.