Can't believe no one has made a Cryptonomicon series. It would be way more complex and interesting than Snow Crash, which has crazier visuals but a fairly simple linear story.
Snowcrash is a lot more visual (it was actually originally intended to be a graphic novel).
I mean, you'd have to cut down some verbose stuff, sure. But you could also expand some stuff, or turn narration into visual action.
(Nice username, relevant to the discussion.)
As far as adaptability of Stephenson goes, I could see Zodiac, or maybe REAMDE, that would work in a way that resembles the books. Maaaybe Seveneves, though you have to deal with the significant separation between Part 2 and Part 3.
The rest of his books, including Cryptonomicon and Snow Crash, are too intertwined with "theoretical" concepts to make much sense in an adaptation. I mean, yes: you can have a show or movie about a pizza deliverer/hacker named Hiro Protagonist who swordfights in the metaverse; or Jack and Eliza's Adventures in Enlightenment Europe; or whatever. But the real underpinnings of the story aren't going to make it in and that's what makes Stephenson's books interesting.
I don't think that'd be too hard to do. You just have to add some sort of ritualistic ceremony or somesuch occurring at the beginning of Part 3 where "the story of the Seven is told".
You'd have a faceless narrator for the seasons of the show that cover parts 1 and 2, and then, once you reach the end of part 2 (at the end of a season, natch), you reveal the narrator as some sort of hierarch who's been telling the whole story up until now, and jump into the beginning of the next season from there, narratorless, possibly with flashbacks to the narrator telling bits of the post-Epic history as they become relevant.
What I really want is an Anathem TV show though.