I think they should just go all out and the "One Man's Dream" sideshow exhibit into a permanent Disney Museum.
My thought is that it would be a much more interesting exhibit if it contained old ride vehicles, imagineering drawings, models, animation cels, and othe rexhibits that would truly classify it as a Disney Museum!
There's not one part of the current exhibit that could not be expanded ten-fold and "plussed" to really make it a great "must-see" destination during a WDW visit.
Not sure why this hasn't been done already. A permanent memorial of all things Disney is long overdue.
As you requested...the Walt Disney Family Museum coming soon to the Presidio in San Francisco.