There are a significant amount of children in our present generation that aren't real familiar with a landline telephone, it's something they have seen at school, or perhaps over at a friend's house, or on TV, but in their own experience they have never actually seen or utilized one in their own household. This trend of no traditional landlines (I'm not speaking of VOIP telephones) is becoming a real rout, in which the landline phone appears to be going the way of Faxing or telegraphs but there is one significant reason why a landline should have a place at the table and that is in true emergencies.
As it stands right now, cell phones are a great convenience, fairly reliable, and ubiquitous. The most significant problem with cell phones, however, is that in an emergency situation, in which there has been a bombing, a tornado, a hurricane, flooding, fire, blackouts, or the like, your cell phone has only a minimal chance of being used as a traditional telephone, and even texting will be queued up in which text messages may not be sent or be received for long periods of time, depending upon capacity usage on the carrier's service.
There is something disconcerting and frightening that when you reach for a device that must work for you that it doesn't. However, your corded landline will often work in situations in which your cell phone has failed you, because your landline capacity works with almost 100% certainty to which the capacity and automated routing of phone calls are part and parcel of the service provided by the landline corporations. Additionally, even with a power outage, your landline will almost certainly work because it draws its power from the telephone line itself in which that power source has redundancy built into it, that allows it to continue to work, or to draw upon emergency back-up power, if required.
This would strongly imply that most families should seriously consider having a landline as their emergency line, just as you are suppose to have an emergency kit and supplies which include water, batteries, food, and fuel. Even in the best of times, cell phone batteries go out, cell phones freeze up, cell phones drop calls, and cell phones simply break. At the present time, cell phones are simply not setup to handle true emergency situations, and it simply isn't a priority for cell phone providers to do so.
Communication is an absolute key in trying circumstances, to which you are either attempting to reach someone to help bring solace or calmness to the situation, or to contact some agency that can bring you the necessary help. When the communication lines are down, panic and frustration is soon to follow. At that point, it doesn't much matter how good life was before, what matters is what is happening right then and there. If by having a landline, you could be better assured of a more successful resolution, than by all means you should seriously consider doing so.