Netflix is still mailing out DVD's and library's have both computers and books. Which is very telling, most often new methods supplement existing systems not simply replace them. The real transition has been cheaper shipping costs replacing the need for local retail and that's been spreading across the economy for decades.

Further governments are often first adapters. Many legacy government IT systems exist, but as they generally work and cost less to maintain than replace. Really the advantage of free markets is information exchange and diminishing returns not simply building large scale systems.

Consider, some cars come with built in refrigerators yet we ended up with roadside stores selling cold beverages. That's the kind of tradeoff markets are great for identifying.