As an immersive experience in a foreign land, the WWHGD-WG was certainly educational. It was fun and challenging to think about where MapBox fit into a landscape of mostly federal government agencies whose only notion of open source was "data not published by me", to steal the conclusion of one conversation I had.
But then Nigel Snoad from google.org made a strong showing at the end of the day and wooed the audience talking about google tools to support layer switching of user generated content + sourcing local knowledge using MyMaps, all while mushing mention of MapMaker + OSM into a passing comment. Given how popular his talk was and how little alternative/real open source tools were discussed, there is huge space for Mapbox to really disrupt a lot of entrenched paradigmatic thinking around open data and user generated content in this community.