> "make our modern infrastructure as reliable as Ma Bell made it 100 years ago"
Sadly, I don't think that makes sense. Switches have a lot more to do a lot faster when it comes to the internet as compared to a phone. 100 years ago, calls were completed by a person physically moving one or more wires from one plug to another.
Better to have an emergency system that will always work - and maybe the only way to keep an emergency system maintained is to use it during non-emergencies. Hard phone lines and radio.
They also have better, more ubiquitous technology. Is an off-the-shelf managed Ethernet switch on a UPS really less reliable per user than a 5ESS? I don't know, but surely only marginally because both are pretty close to 100%, and the main cause of failures is human errors on both systems.
The actual problem people have with VoIP landlines is that they require power at the customer end. A traditional analog POTS line supplies power from the central office so it doesn't need any from the customer, unless they want to use a cordless phone, which takes more power than the central office provides. A fiber VoIP line requires power at both ends no matter what.
Note the original phones actually didn't have "central battery" as they call it. Instead each phone had its own battery, designed for about 6 months of usage, and every 6 months the phone company sent a wagon around to replace everyone's phone batteries.
Just a nitpick - by 1926, about 20-30% of Bell exchanges were already automatic, on Strowger https://en.wikipedia.org/wiki/Strowger_switch equipment.