IIRC, though I might be confusing this site with another forum, there was asuggestion (or a brief moment) when new posters were restricted in the topics that they could post to, and included not being able to post new topics (or some such restrictions). Things changed and the 'suggested topics' topic arose. (Don't quote me on this, as my memory of how things were is probably corrupted by all the other forums I visit.)
The point is, that while the site admins have recognized the 'dog piling' that occurs, there is not much that I believe can be done besides a marked increase in moderation, and that itself leads to the inevitable charges of bias or poster discontent. Besides self-moderation, in an attempt to limit the 'dog-piling' (which keeps me out of many debates I would love to join or even continue), I am not sure what else could realistically be done. The fact is that scientific debate can be this way, even among 'professionals'.