I wonder what adoption would actually look like.

It reminds me of Google Dart, which was originally pitched as an alternate language that enabled web programming in the style Google likes (strong types etc.). There was a loud cry of scope creep from implementors and undo market influence in places like Hacker News. It was so poorly received that Google rescinded the proposal to make it a peer language to JavaScript.

Granted, the interests point in different directions for security software v.s. a mainstream platform. Still, audiences are quick to question the motives of companies that have the scale to invest in something like making a net-new security runtime.