I understand your point but without a diversity of degrees I think there will also be a loss. Perhaps not an obvious, quantifiable loss. If everyone got a STEM degree in Denmark (include economics and finance) I think the consequences would be as bad if everyone got a degree in history. Having a society in which people care about others and want to live in requires more than quantifiable utility.
I think focusing on "marketable" is not a good governmental policy. It seems to me that education is the correct level of focus in terms of governmental policy.