In fact, note that the concept of a jury is intended to work this way (although is missing many elements, and exists under the permanent organisation of the court) - a temporary organisation gathering to find justice, then dispersing.
Unfortunately it's difficult to tell the exact outcome of implementing any of it on a wider scale, as the times leftism has actually been in power have largely been during times of war where a lot of theory was thrown out the window, or using leftist messaging to implement something closer to a dictatorship. All we know is that a lot of it works when implemented in our own communities.