Final paragraphs from a bitcoin reality check; also see Bitcoin and the Digital-Currency Revolution (WSJ)
"“The penetration has really been quite small, relative to the media hype,” he said.Despite fall, bitcoin fans keep the faith - Business - The Boston Globe
Yermack did say the blockchain has great promise to safeguard other vital information. For instance, the title to your home or car is recorded on a piece of paper and on a computer in a government data center.
“It can be altered, forged, burned down, and lawyers have to be paid to go looking for it,” Yermack said. But putting the same data on a blockchain computer network would be cheaper, far more secure, and easier to access, said Yermack, who predicted the blockchain technique will become the standard method of recording many important transactions."