It's not doable with the current state of historical science

Victoria is a very abstracted game. All the factors that disappear from the equations have to come in as luck and random events. Now, as you include more factors to constrain the actors, the simulation would follow history more closely (and become progressively less popular with the players), but then you'd have another problem - whose version of history to follow? There are as many opinions on any given matter as there are historians. History is not like physics, where you can make a theory to fit the data. In history, there are no controlled experiments and all observations are hopelessly flawed and one-sided. And then you have to consider that the world may not necessarily be deterministic...
Well, you get the point. You don't want a game that turns out 100% "historical" without a human player
