That is sort of my point though. On the other hand, I can see myself just stopping to use sites that abuse JavaScript, keeping the "good" ones. Maybe that kind of feedback just have happened on the web a long time ago.
Nothing beats the ease with which the regular flash player can be blocked, and then occasionally loaded by mouse click as it works with flash block and the like. The danger of it becoming an extension is that it's now more difficult to have that block/override workflow. And there's always the dreadful prospect of people embedding it directly into their site, potentially leading to a new wave of blanket JavaScript blocking as a response.
It's probably always a bit of both, but I'd say that level of success doesn't come without the necessary context (several things have to conspire for it to happen). Anyway, it's an inspiring story!
It's encouraging to hear this can work. Of course that guy was extremely fortunate to be making something everyone was interested in, so it's still a risk (but then again: what isn't?).
I signed up for it. I thought about joining nReduce when it was still new but at the time I didn't have an idea... and now they're gone. I would be willing to try this out now.