Now that links can be added into comments inline, this should be done with the automatic 'possible duplicate' comments added when a vote to close is made. It would make sense to place the question title in the comment, instead of the link.
e.g., instead of
possible duplicate of stackoverflow.com/questions/216819/…
possible duplicate of [How does a debugger work?](http://stackoverflow.com/questions/216819/how-does-a-debugger-work)
which should render as
possible duplicate of How does a debugger work?