Ya agreed! I've wanted to build this thing for a few years now ever since I saw Bret's demo.
https://twitter.com/getfiggo -- Nothing really going on yet. I'm maybe 2 months away from having a working prototype. Spent about 6 months working on the core rendering engine: reactive property expressions, repeating groups (like a rectangle + label for a bar chart), paths with repeated segments (for line charts) and am now working on drawing tools and how a user can wire things up.
Here's a fun little animation I made while experimenting with the tech [1]. I was pleasantly surprised at the awesomeness that can come out of simple systems.
[1] https://imgur.com/a/ELhwWo5