Unfortunately, given the fragmented traditional curriculum, many teachers will resist undertaking instruction that deals with reality holistically. State mandates, college entrance requirements, and other bureaucratic demands create additional difficulties or perceptions of difficulty to overcome. Given the current level of public suspicion and paranoia in many parts of the nation, the less apparent change in the curriculum, the better. The traditional academic disciplines are the organizers of the curriculum of nearly every secondary school, college and university in the nation. Departmental lines within institutions are drawn by them.
Budgets observe their boundaries.
Administrative structures reinforce them. Professional organizations guard their interests. Lives of service are devoted to them. Alternatives to them are almost literally unthinkable. They are not going to go away.