It's definitely an interesting thought. To some degree, it's maybe impossible to avoid the filtering down / reductionism of a big vision, even if you wait until things are polished. I think the hope with the Mother of All Demos was to try to shift people's thinking about computing and try to change where efforts were directed. You could imagine researchers attracted to the vision, working on problems there, and eventually working with commercial partners (or doing it themselves) to solve some of the technical, scale, and other problems that occur when a research vision goes through the filter of reality.