The problem is that Quora's design is not aligned with the companies motives:
"Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it. The most important thing is to have each question page become the best possible resource for someone who wants to know about the question." - from Quora's About page
A Question and it's related answers can be archivable (Who invented the atomic bomb?), temporal (What is the current status of Zynga's zLive?), or anywhere in between (Who is the lead UI designer for Mac OS X?). The design is ONLY composed of real-time design patterns, mostly taken from Facebook and Twitter: mandatory account registration, asymmetrical following, news feed, real-time notifications, user messaging system, etc.
There is NO focus on archivable questions. The website is based around questions and answers happening right now, which isn't what Q/A is all about.