What makes you say that? Has anybody tried?
Just a quick and dirty in Logic, but the tempo of that clip appears to vary somewhere between about 145bpm and 160bpm sixteenths, in 3/4 time. That’s a credible tempo for one-note-per-string playing. I don’t know that the “distance” between the strings is really that much of a factor. One of the nice things about the wrist is that it already operates in the plane you would need to travel between the strings with relatively little help from other joints. We’ve seen Molly Tuttle do three string rolls, including inside picking, in that tempo range, while singing, at 10 in the morning with no warmup. Unclear whether or not she had any coffee beforehand!
Amazing players like Anton and Molly show us what is possible on the instrument and expand our minds in the process. I will admit that I do have a bit of an aversion to breathless deification of these skills, mainly because I like to think of everything as doable by everyone with the right knowledge. It’s kind of why we exist in the world. There’s a quote from Victor Wooten about how he likes to think of techniques as “easy” because it gets you one step closer to doing it. Words to live by.