When people start coming out of the woodwork to take credit. Stats from a recent Directions article on GeoJSON:
Number of times an author of the GeoJSON draft is mentioned by name: 0
Number of posts to the working group mailing list or wiki by anyone from Safe Software, the company prominently linked in the article to GeoJSON: 0
Frankly, the thought of people storing data in the GeoJSON format on their filesystems, or emailing GeoJSON attachments to their customers, scares me. That's what GML is for. GeoJSON is just a way to encode simple geographic data structures on the wire between web clients and web servers.