Though specifically for a Maryland county parks and rec dept, this strategic plan document might be useful for museum professionals who could be involved in similar long-term projects.
A Belgian-based organization seeking to apply strategic foresight planning in nine key domains and a trans-domain group. This one, Individuals, Societies, Cultures and Health (ISCH) has elements dealing with material culture, history, music and art and other museum-related topics.
The SFI report Crisis and Disaster Resilience 2030 focused on a deep analysis of future emergency management needs. The more recent document Toward More Resilient Futures: Putting Foresight Into Practice shifts the focus from theory towards practice.