Earlier quoted context omitted.
Can you elaborate on how a test might cause permanent damage? Keep in mind that it should be clear whether significant damage is occurring quite soon after it rolls out. (Eg. Whether comments are getting approved, rate of comments, etc.)
I meant it to go along with the rest of the paragraph. I think you'll see people turn around at the door with this policy. I would have.
On the other hand, you might also see more people coming in the door. What if this makes conversation on HN so much better that more people want to get involved?
The one thing that is certain with the new system is that if your comments are abusive, they will probably not get endorsed. Perhaps at first they will (protesting 1k+ karma users) but eventually anyone who is endorsing poor quality comments would likely lose the ability to endorse.
At a minimum, I think this a really interesting experiment.