Particularly when you hear of countries outside the US, 100+ mbit Internet is a very relative thing and it depends very much on where that traffic is going.
I'm all for building out last-mile distribution with fiber, but what's possible on Cable and DSL is very good and adequate for the current generation of services if the policies would match what the technologies are capable of. The elephant in the room is that good Internet will continue to eat the lunch of Cable TV and phone. Bandwidth caps are more about keeping you in line as a "good consumer" than the economics of IP transit.