A down vote is not marking it wrong. It is indicating that it is not useful (compared to other content?).

As to "timeless" - consider that even such material can expire. The "timeless" information about how to simulate a closure in Java (valid from 1996 to 2014) is no longer timeless. The timeless material applicable for all versions of Python (until Python 3) would make it just as difficult to get rid of as a green checkmark next to the answer that someone found helpful at some point in the past.

If you ever create a meta-moderator user script for Stack Overflow I'd be interested in seeing how well it works. The biggest problem being the volume of material that is coming in on a daily basis.