I wonder how DJ and Jamy Ian Swiss feel about Penn & Teller (and various YouTube participants) lifting the veil on the chicanery used to produce magic tricks. As Randi has repeatedly pointed out, even if people know how it’s done, the need to believe in magic (and the supernatural) is so strong, they will forget that they are watching trickery.
The most sure example of this is mentalism. Believers know that there are charlatans out there among the mind-readers and clairvoyants. “But surely,” they think, “my favorite mentalist really has the power to see into my mind and into the future.”
I don’t think that people will turn away from stage magicians because they find out how the tricks are done. Instead, either they’ll go just to see if they can figure it out, and lord their watchfulness over their less observant neighbors.