Ooo, that'd be cool. Can't get Welles, but it's only a matter of time before image capture becomes sophisticated enough to recreate Grant and Veidt in a virtual format.Impossible now that they are dead, but a 1940's Batman directed by Orson Welles, starring Cary Grant as Batman and Conrad Veidt as the Joker.
Wow, how could I forget 3 of my favourite novels?! The Dream Park trilogy by Larry Niven and Steven Barnes. These are perfect for big screen treatment and have indeed been optioned in the past, at least once by Spielberg.