I think visions can play out far beyond ten years, and their disclosure could potentially further cement existing power structures, such as Apple.

Of course, relying upon NDAs in lieu of real trust is trash anyways. Ideally, an [extremely well treated and compensated] team could maintain strict confidence based on ideology alone. Your mission just has to actually change the world for the better in some dramatic way.

To play devil's advocate, myself and quite a few other people probably have a keen interest in precisely what the nature and vision of Apple's long-term research was, even a decade ago. People like Bret think far beyond time scales that measure a single decade.