If you're not a Mac user or are too young to remember it, let me give you a little background. HyperCard was a simple development tool provided with the Mac prior to Mac OS X. It had a drag and drop interface builder and a simple programming language similar to AppleScript. I saw the appeal of an English-like programming language but also quickly discovered the concept's Achilles' heal. In English, you can say the same thing many different ways. In HyperTalk (the programming language of HyperCard) there was usually just one way to write the code for a particular function. AppleScript suffers from this same problem which can make it quite frustrating at times. One of our engineers once called AppleScript "a read-only language" which is a great description. It's easy to read AppleScript code, but very frustrating to write. HyperCard also suffered in that it did not support color and could not be used to build standalone applications. If you sent a HyperCard file (called a "stack") to another person, they needed to have HyperCard installed to run it.
Despite these limitations, there was an attractive simplicity to HyperCard.
So, despite its simplicity and popularity why did HyperCard die? On the show, the hosts suggested that Steve Jobs killed it. One of the things that Jobs did when he returned to Apple was simplify. He very correctly and intuitively understood that Apple needed to focus on a smaller number of projects if they were going to produce great stuff. Also, one of the features of NeXT that Jobs was most proud of was its advanced (at the time) visual development tools and object-oriented language. He believed (correctly as it turned out) that object-oriented programming was the future. So if you consider how important Jobs felt it was to focus and how he felt about the development tools brought to Apple with the acquisition of NeXT, it's easy to see how Jobs would feel that two development tools was one too many.
But I think the real reason is far simpler. Bill Atkinson was the main developer behind HyperCard. He left Apple in 1990. Without Atkinson pushing HyperCard, it was quickly abandoned inside of Apple. There were probably few who knew the code or who had anything like the passion that Atkinson had for it. As a result, updates were released with decreasing frequency and in 2004 Apple finally killed it.
In their podcast, John Gruber and Dan Benjamin discussed what development tools exist today that fill HyperCard's void. I was quite happy to hear John mention Realbasic. It won't shock you to hear that I think Realbasic/Real Studio fills this gap nicely. One of the big problems John felt HyperCard had was that it couldn't build stand alone apps. Even if it could, Hypercard didn't use native controls so the apps would not have felt like true, native applications. Real Studio of course builds native apps and uses over 40 native interface controls.
It has always been my vision for Real Studio to be an easy-to-learn and easy-to-use development tool that is powerful enough to build almost any kind of app while supporting all the important platforms. The only platform Real Studio is missing at this point is mobile and that's something we are working towards. It's just never made sense to me that a developer should have to learn lots of different languages and development tools to build different types of applications.
HyperCard was one of the first visual, integrated development tools. That was a significant innovation. While HyperCard and Real Studio are very different in many ways, they have the same goal: to make programming accessible. I think that Real Studio has done a good job of taking over where HyperCard left off.