This.
Regarding telcos, something interesting happened here in Chattannoga, TN. We have a community-owned electrical coop called the Electric Power Board - it's our electric utility. One of their major costs is meter reading; it's also one of their major liabilities. Due to the non-conductive nature of glass fiber, it can share their vaults. So they embarked on a five year project to provide multimode fiber optic cable to every customer - something no cable or phone company will do. They even finished early. This allows them to install smart meters which can be read remotely, but it also allows them to offer telephone, television, and fast Internet service to every household, at competitive prices. Comcast and AT&T fought it in court as unfair competition, but lost. Now every electrical customer in the area (which includes parts of other counties and even part of Georgia) have access to at least one reasonably priced telephone, television, and fast Internet provider. Even far-flung rural customers have this, as reading their meters costs the most.
So while vanishing landlines may discourage telcos, that void might also be filled by electrical utilities.
Another benefit is that it allows the EPB to eventually bill per time of day. By changing people's behavior via financial incentives, they can more evenly load the grid and avoid such an outsized peak load.
