Sure: but the point is that whatever tricks you can pull, you're just slightly bumping the capacity of what is fundamentally a shared channel.
We already have ubiquitous wireless internet: it's wifi. And it gets faster every year, provided we deploy a base station every 10m with fiver backhaul (aka your regular home internet connection).
Directional can scale enormously vs omni directional. And MIMO can scale to a ton of antennas, especially in something like home internet where device size isn't a limit.
Do you think it's practical to put dozens of antennas on every residential property?
That's the point: with enough effort you can make any sort of wireless link pretty arbitrarily large and more "wire-like". At an extremely disproportionate increase in cost of equipment and sensitivity of antennas to positioning.
But now you're competing with the installation costs of fixed cabling anyway - we're not talking about small portable devices any more which a consumer puts "wherever" in their house. We're talking large fixed installations which need to be aimed and calibrated correctly, and consume substantial power (the Starlink rectenna for example is not a low power device).
The moment you've got skilled labor having to come out to the property you've lost: it's just as easy for the skilled labor to install fixed line cabling, as well as less disruptive to the home owner and it is very likely a lot cheaper. Our cities are well setup to bring things into people's homes - we have water, gas, electricity lines that need to go everywhere. The cost is not in the device, it's in the labor.
> Do you think it's practical to put dozens of antennas on every residential property?
Yes, high end cellphones already have 8x8 mu-MIMO. It can be in an array and isn't like putting 12 separate antennas in different places on your roof or anything. Starlink (phased array, different tech) has hundreds of antennas (https://www.youtube.com/watch?v=iOmdQnIlnRo&t=36m30s).
You might be thinking of like TV antennas where they often were much bigger due to the longer wavelengths involved in VHF.
Even if it were big, many many rural homes used to have those crazy big 80s/early 90s c-band satellite dishes just to get more TV channels, and for someone with a poor internet connection I could see them even putting something like that big up if it were required.
We already have ubiquitous wireless internet: it's wifi. And it gets faster every year, provided we deploy a base station every 10m with fiver backhaul (aka your regular home internet connection).