A big problem with the XIP thread is that it is simply not palatable. It takes a lot of commitment just to read the thread, not to mention putting out a sensible review comments like e.g. Chuq and Matt have done. The issue is complex and the code involved is even more so. However, that is no excuse for a confusing presentation. It seems like hardly anyone can follow what is going on, and usually that signals that the audience is not the root of the problem.
A while back chuq promised to send a mail classifying his points into clear showstopers and issues which can be handled post-merge. Let's start with that list (hopefully we'll get it soon) and see what exactly are the relevant issues remaining and solve *only* those issues. What needs to stop is threading to other areas because $subsystem is broken beyond repair. We know, but let's just handle the problems relevant to XIP for now.
