Think of it this way, if five, not particularly experienced programmers, could dive in and just create a fully functional distributed-replacement for Facebook, then wouldn't that make a mockery of the skills/experience of developers that spent a lifetime acquiring them?
If anything, this enhances the kickstarter ecosystem, putting an emphasis on how important it is to evaluate the experience/skill of the principals behind a project.
For the counter-example, look at Dalton Caldwell's App.net. Here is a guy with a heck-ton of experience, and, from what I've heard, a talented developer.
He had a mostly functional API/Alpha of the twitter-clone portion of app.net (and, long term, I think the twitter component may not be the most important element) before they had even reached their funding target. And, the UI/App continues to land new features, week after week. In less than a month, alpha.app.net is already more feature complete and functional compared to where it needs to be to replace Twitter, than Diaspora was after two years.
Talent and Experience are critical. A great developer can accomplish in a few weeks, what less talented developers can't accomplish in a couple years.
That's my takeaway from Diaspora, and it's kind of a positive message.