There are over 300 games, zines, visual novels, and toys built with Decker on itch.io: https://itch.io/games/tag-decker
Last month saw the first game made entirely in Decker published on Steam: https://store.steampowered.com/app/4693460/The_Dreams_in_the...
We are neither living in the past nor wasting our time.
A few years ago, I think there would have been a market for a HyperCard-inspired tool that targeted modern technologies - probably web tech.
Today, I guess vibecoding is what HyperCard was in the 80s and 90s, the tool you can use to quickly and easily build a little program that fills your specific need.