aristotle - 9:35 pm on Jun 16, 2012 (gmt 0)
The articles get the majority of traffic (and the majority of inbound links).
If it were my site, I wouldn't delete them unless I was pretty sure they were the main cause of the problem. And even if I decided to delete them, I would do it gradually.
I seem to remember that you brought up the possibility of re-directing these pages in an earlier thread. But I wouldn't do that either unless I was pretty sure it would help.