Serious question re: With this fork io.js has won pretty much all the mindshare of the small core
Who and how many of the earlier Node.js core developers are still developing for Node.js, how many are developing for io.js, and how many are developing for both?
Depends on what you mean by "still developing for Node.js" which is subjective. Going strictly off activity, the graphs on github[1][2] show node trending ever downward from a high back in early 2012, and iojs significantly spiking upward within the last few months, approaching 2012 levels. (Obviously all but the extreme right edge of both graphs share the same data.)