It depends. Can you give some indication of what coalition with this intent you assume? 

• A strong majority of the government is in favor of introducing the subject (say, >60%).
• A group of experts advising the government has strong evidence that the subject provides large societal value (say, equal to an expected increase of GDP by 1%).
• The general population has a consensus that the new subject is valuable (in some clear but not necessarily precise sense, e.g., "good for future job prospects").
• The teachers that will teach the subject are generally in favor of it (either enough of the existing teachers who will have to do this, or the experts who will have to teach the future teachers). 
• The administrative organs of the government are given the order to implement the new subject, e.g., by passing a suitable law (assuming the administrative organs are sufficiently capable of doing so).

Additionally, I guess we assume that adequate monetary means are available for this endeavor, right? It is an investment, the new subject will start to pay off after 20 years earliest (30 if you have to teach the teachers), right?

Not sure whether setting this up as a related question that is hidden from the front page was the best approach. Maybe I should have selected that it should be posted to the front page instead. First time I'm using "Ask Related Question".