No. Please don't.
The way the web interface works, it automatically shows only 500 comments, and only the top few levels. You have to click a bunch of times to see more comments.
I'd rather have it separated out than to have a really really long thread to wade through. Very long threads are difficult to read and keep track of.
Now, if you wanted to start a new thread after every new update AND when they reach a certain number of comments, that makes sense.
There's a show all button near the option to show 200 or 500 - click that once and the whole thread loads, other than deeply nested comments.
The new thread, discussion 13, is here.
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. With three chapters recently the previous thread has very quickly reached 1000 comments. The latest chapter as of 25th March 2012 is Ch 80.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author's Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight, nine, ten, eleven.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: