Why a Century of Rotary Telephones?

The technology concept for building the Internet existed for decades before it commercialized. What was the barrier to commercialization?
Privately funding the shift from rotary telephones to the Internet required the courts to declare the Federal communications monopoly unconstitutional in 1982. The technology to implement the Internet had existed for decades. As noted by Madison Federalist #62, for capital to invest in innovation requires governments to respect free markets.
"What prudent merchant will hazard his fortunes in any new branch of commerce when he knows not but that his plans may be rendered unlawful before they can be executed? What farmer or manufacturer will lay himself out for the encouragement given to any particular cultivation or establishment, when he can have no assurance that his preparatory labors and advances will not render him a victim to an inconstant government? In a word, no great improvement or laudable enterprise can go forward which requires the auspices of a steady system of national policy."
Privately funding the shift from the 25 mpg efficiency of the Model-T to solar-powered networks requires governments to enforce the free market provision of the Constitution's "post Roads" mandate. Climate Change, oil-wars, and traffic jams resulted since The Federal-Aid Highway Act of 1916 created the current Federal transportation monopoly. As noted by the Congressional study "Automated Guideway Transit", innovation has been blocked for "four to six decades."