Long comment threads on blog posts are a mixed blessing. It is great to have stirred up such great community discussion. But anything beyond, say, 20 comments is beginning to get beyond what anyone is willing to actually read. What likely happens is people read the article, read the first few comments, then start just scanning them (at increasingly swift rates) until they hit the bottom, then read the last one or two. At least, that's what I do.
This is an interesting old thread. Could use some contemporary examples.