However, this seems like a really neat organization management solution. Voting and discussing formal proposals has never been a sexy proposition; and this is the first tool that I've seen that attempts to improve that.
Now, it's going to require some much more serious security guarantee to be used to govern any important organizations (governments, public corporations, etc.). But as a way to manage smaller communities (e.g. online communities, clubs, anything with smaller-scale voting, even potentially smaller municipalities), I see great potential.
I don't think that's the real hurdle for scaling up. The issue for large-scale democracy has always been that, because an individual's time is limited, it's very hard for them to make a reasonable appraisal of everyone else's opinion. If these comment threads were merely thousands of posts long, could you read through more than one of them and still have a life? And that's only thousands; the voting population of the US is a bit over 200 million.
I'm really, really looking for the tool that lets you successfully absorb thousands of opinions around an issue within a reasonable time frame, without intermediaries. That's the killer app for democracy.