Success of the EHR

Considerable investments have already been made toward the development of EHRs across the country (in Ontario as well as other provinces/territories). Despite that, according to the HIMSS Analytics numbers, we have little to show for the dollars spent.   The most recent numbers are at the following link for Canada and the United States (Links to an external site.)
What might be the reasons for the lack of success and uptake of the EHR in Canada and its jurisdictions? What are the challenges, and how might they be addressed?
Support your response with literature. Consider, other jurisdictions (countries) might have similar challenges.