We were talking about in-car streaming, until you changed the focus in order to declare my analogy invalid. If, as seems likely, radio is gradually replaced in the car with streaming, that "last mile" is going to be the one most highly competed for by all the vehicles using it.
Of course there will be an expansion of bandwidth, but the question becomes: Given the increased level of demand, can it be provided cheaply enough to become as ubiquitous as radio ... and in what timeframe? Keep in mind that the highest percentage of radio listening already takes place in the car and suddenly it's your "last mile inside the house" that becomes irrelevant to the question.
Not irrelevant at all. The point is, the more WiFi access points along the highway, the less WiFi traffic that needs to travel through each access point to join the wired infrastructure. When using WiFi in your home there's very limited traffic through the short gateway to wired internet. Unless several families move into your home you're not likely to run out of bandwidth. And of course my main point was that a wired or fiber connection is not necessary to create a hotspot as you claimed in your retort to another poster. Any device with cell data can create a hotspot.
I know it's difficult to imagine the future scale of technology. In the early days of digital photography everyone (including me) thought it had its place but would never replace film in terms of quality. Reliable, seamless WiFi in cars and everywhere else will be reality before long, and may even replace cell service. I can't wait!