Flash got close, but was too complex and expensive for the average user (HyperCard was initially free, but was not bundled with the Performa line of Macs). HTML captured a lot of what HyperCard offered, but web authoring tools never got as easy and still don't offer one feature that HyperCard did--consistency of the look and feel of the UI, which can be a good thing or a bad thing, but some users liked the fact that they could create a flipbook by adding two buttons (previous, next) to a page. Some even started businesses selling educational material bundled as HyperCard stacks. The HyperTalk programming language was not great though and was one of those languages that hippies liked but the average user was as lost with it as with C or Pascal. I always had a feeling that Apple tried to control what you could do with it too much, which is the opposite of what I expect a programming language and the tooling around it to do for me. If you want to get a feel of what it was like to code in it try coding something in AppleScript, you will see what I mean.