The favored medium for providing symmetric, two-way broadband is glass. And glassing all of America immediately would be very expensive, for the poor and the middle class, too. But the highway analogy is all wrong, for reasons rooted in basic economics. By the same token, production and consumption must balance. The average Joe can consume only as much wheat as the average Jane can grow.
Information is completely different.
Rich and poor alike, we all run information deficits. We all take in more than we put out. Networks have to be built accordingly. The markets have already grasped this, even if the metaphor makers haven't. Smart people are putting their money in asymmetric technologies, with far more bandwidth coming than going.