The answer to the question of advancing bandwidth to our portable devices, where a dedicated pre-selected length of wire would be undesirable, lies not in finding a better way to make a hardline wire to it, but making better use of wireless design.
High bandwidth optical communications, such as what we use in fibre optics, can work surprisingly well as a wireless system. However the transmitters and receivers require direct line of sight, and may be interfered with due to weather conditions. [or someone/something stepping into the beam...] The other drawback of running open optical systems is that they can quickly reach a saturation point where sending-receiving pairs that are spaced too close together will risk cross talk as the receiver from Pair A begins to pick up parts of the signal from Pair B's transmitter.
Along with removing the requirement of line of sight, routing optical signals through dedicated fibres means we can pack far more Sending-Receiving pairs into the same space.
It is really this cross talk risk that is the heart of our bandwidth problems, whether dealing with Optical, Cellular Signals, or home WiFi, we will quickly saturate an area with competing signals if we use devices that blast data over a wide area without concern for where the other end is going to be.
So, how do we resolve this?
We begin limiting the wireless signals to more confined and better defined regions.
This concept is seen all the way back with the original cellular networks [and is why they're called cellular...]. Rather than broadcasting one signal that can be seen everywhere, you split "everywhere" into smaller regions that are covered by weaker signals [such that signals don't overlap any more than needed], and you can then squeeze more data through the whole system.
As such, we apply the same solution by adjusting the scale again. We use smaller cells that will cover fewer users, freeing up more of the max transmission bandwidth for each user.
Have a Network Signal that covers an entire neighbourhood that is becoming overloaded?
- Run hardline to each house, and give each house a smaller wireless network that doesn't spread much beyond each person's yard.
Is the 'whole yard' system getting saturated?
- Run hardline to each room in the house, and give each room an even smaller wireless signal network so that devices in different parts of the home aren't trying to 'talk over' each other.
Need more bandwidth in the room?
- Again go smaller and more focused. Rather than broadcasting a blanket signal across the whole room, use a different wireless style that focuses better and sends tighter beams aimed at individual devices.
Need to go even smaller?
- Cover the ceiling with an array of transceivers that can beam data directly at the device with laser like precision... [Just remember to design it in a way that avoids blinding people... Using actual lasers that can be misdirected off mirrors or something could be problematic, but there are totally ways around that sort of thing.]