Here's how it would go down today. Walt would have a lookalike thanks to the power of plastic surgery in each of the Disney parks on the planet. Through an intensive brainwashing/torture program each of these lookalikes would behave exactly like Walt. No one would ever know when they were being visited by the real Walt, since when he was traipsing about a park, DLP for example, the lookalike would be chained in a basement room somewhere, fed gruel, and flogged for indiscretions/slip ups as part of his "re-training". This technique would be referred to as wuing (short for Walt upgrading) by in the know CMs.