Not convinced by the author's theory. If you extend Hypercard to its logical conclusion you get either Flash or a browser running HTML locally. In any case you

Not convinced by the author's theory. If you extend Hypercard to its logical conclusion you get either Flash or a browser running HTML locally. In any case you get a security nightmare, a lot of duplicated efforts, and the need to solve hard problems which didn't exist back then such as adapting UI to different screen sizes, accessibility, internationalization, publishing stacks on the web, etc. Also, there were some commercial products developed with Hypercard back in the day... but these days you'd need a different development environment that supports things like versioning to entertain that possibility.