As always with Bret Victor, the idea is huge and you can't help but get excited, but as a programmer of 35 years I'm always left wondering "well that is total cool for X and Y but how would you do Z?". I guess I just don't fully understand how rich the building blocks could be and whether you could be expressive enough to actually solve the same kinds of problems we do with other languages. Time will tell.
dynamic land looks like a hoarders dream