[inimino]

HyperCard failed, but not necessarily for technical reasons.

It might be worth making some hypotheses and testable predictions here about how much complexity is needed for various tasks, and how well current tools are doing at avoiding unnecessary complexity.

I think surveying the current landscape and past efforts, and getting a dialog going along the way, would be a lot more valuable than immediately starting to design a solution.

I'm very confident there are opportunities here, but not so confident about the chances of any particular approach.