Index: django/contrib/contenttypes/management.py
===================================================================
--- django/contrib/contenttypes/management.py	(revision 12213)
+++ django/contrib/contenttypes/management.py	(working copy)
@@ -30,8 +30,7 @@
     # related permissions.
     for ct in content_types:
         if verbosity >= 2:
-            print "Deleting stale content type '%s | %s'" % (ct.app_label, ct.model)
-        ct.delete()
+            print "Content type '%s | %s' is no longer used." % (ct.app_label, ct.model)
 
 def update_all_contenttypes(verbosity=2):
     for app in get_apps():