I would agree with all the points that Chris made.
The question is really how big of an audience it would attract over the current user base.
Most physicians are already using an EMR and most are now working with groups that are reticent to change. Even if it's a direct port of the current AC, would it bring enough clients to support it being built.
The current user base would not really want to pay more and the cost of building it would be on us if there are not a lot of new users.