In the simplest of terms, a transfer medium can be viewed as a pipe and the information that is put through it as water. You don't have to be a farm boy to know that the bigger the pipe, the more water you can get through it. The same thing is true with information technology. The phone wires and the cable wires that come into your house are simply not big enough pipes to handle the massive amounts of electronic information necessary to make interactive video function. Much of the current effort is to find ways to compress that information to make it smaller.
Digital information is more like steam than it is like water.
But when steam is condensed, it is water and it is very hard to make it any more compact than it is. Compression technology will eventually reach some limits, while at the same time the total amount of digital information sought to be transmitted will continue to increase geometrically. Obviously, something has to give. There has to be a better way, and there is. The better way is sitting on my roof.