Interesting Thought,,,    Its amazing that a lot of the solid state games from the late 1970s, Flash for instance has lasted this long. As you said Pinball Machines where only made to make money and those machines had sort of a use-by date and built to last at least ten years or so. I think now that people are rescuing pinball machines, restoring them and storing them at home in working condition has preserved the Pinball Machine. Thank God for collectors like us  . But who noes where pinball will be in the next 50 years?