I have blogged about this before. I know it is getting pushed again as a cost savings measure including by a candidate in the 5th.
The challenge with Electronic Medical Records (EMR) is not the technology, it is the change in processes that the technology requires. That is going to eat a lot of the early cost savings, when working with a medical practice to pick a system I remember one of the vendors commenting on how they would want to reduce the number of folks they would see by half for something like over a month and slowly work their way up to their previous productivity numbers. Because the technology could be so disruptive.
Also their are a finite number of folks who understand software and the practice of medicine enough to do these implementations.
It isn't going to happen as fast a people want/hope.