Another page for the COST Web site with a link to Foresight 2030 reports, including the overall summary report. While not museum-specific, there is much to ponder broadly relative to technology, innovation and changing conditions in the world.
PlaNYC 2030 - a cool future plan for NYC. Of note for my interest is the chapter on Parks and Public Space, but others may find other chapters of interest, especially in terms of how they envision the city 15 years into the future.
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.
A 2005 report that does not appear to have a specific long-term focus (as in the future to 2030) but broadly outlines ideas for the "future." Still, this UK association does discuss ideas for improving the management, generally speaking, of museum collections.
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.