The problem with your logic is that not every URL has a meaningful title.

There are a lot of times websites that are not optimized and use titles that sometimes are as self-explanatory as "home". I have discovered news websites that don't have a title for each of their articles, even larger sites like pehub.com didn't have titles until they fixed it only some weeks ago.

So this is going to be more horrible than editorialized headlines.

After thinking about it, here is a easy solution:

In addition to discussions, allow titles to be flagged by the community. Example below:

  submission X by kdzsb 22 minutes ago | flag title | flag discussion | 9 comments

Moderators would simply edit the few flagged bad titles. Rather than having them to watch all titles (old rules) or no titles at all (new rules).