If only because of privicy issues. If the system was open to all medical practioners or just restricted to hospitals but fed into by medical practioners there would be a horendious number of people with access to the sustem and it would prove impossible to make secure no matter what was put in place.
Currently the best use for IT in medicne is with remote operations where someone can have an experienced Surgeon on hand even though they are in the middle of nowhere in a different country this shows great promise as it would allow advanced medical procedures to be dome in places that would normally be unable to treat these people but and here is the big but when something breaks down and the signal is lost the guy in the OR is on his own with no backup available and as he and the staff there couldn't normally perform this type of opperation then they are in trouble and they will in all likely hood lose the patient or leave lasting injuries that they can not fix.
Now when this happens who is held responsible the Medical people who are performing to procedure, the medical people advising or the IT person down in a dark dingy hole with no support or backup available?
Yes It does have a lot of promise for medicne but it also has a lot of pitfalls as well what we have to chose is are we willing to put up with the pitfalls just in the hope of increasing less hands on work elsewhere?