I'd like to conjecture a bit about the blog post...
Given that Chris Avellone is at least a level 12 intellect, I think the recent hits this forum has obtained are well within his expectations.
But also, given how much Avellone promotes and facilitates access for young hopefuls into the videogame industry, I am starting to think that the reason behind the blog post is to show, potentially at least, how an outsider could influence in a videogame production. What Kickstarter does is democratize funding, so maybe the message here is to inspire everyone to pursue their own game project...
I dunno, I'd like to think that more than a mere gauging of public interest, there was some trickery behind all this.
All the responses and suggestions have made me wonder something, all this interest in making RPGs... do people in this forum play PNP games? Do they have experience DMing? With so many people asking for a complex, dense, heavy roleplaying experience, I am sure we could start something less ephemeral than forum posts for all those fantastic ideas. How does the idea of a small group of people willing to play an online tabletop RPG sound? If enough people are willing, those ideas could be transformed into world reference documents.