Hopefully they adopt Reddit's pattern of constant tweeking and improvement. Reddit now has a significant track record of adapting to the harsh comment environment that is the open internet, and it works surprisingly well.
I'd be interested in hearing your observations about what works surprisingly well, if you'd care to share them. Probably best at hn@ycombinator.com, so we don't pull the thread off topic.
Please, yes. They can spin up an instance of R2 and have it running a test site in less than a week. They can even have a completely open development model, a la Linux kernel, if they want.