So, because of Darren Cook's answer to the EOL reminder I made back in May, and how people apparently don't like the status quo, I'm dredging this whole discussion back up. Because of Darren. So blame him.
This was Darren's answer on the EOL notice thread:
Might I suggest an alternative approach, given that unsupported-by-Canonical versions of Ubuntu keep running fine, and that the Ubuntu desktop upgrade route past 10.04 is unpopular with a significant number of users:
Instead of flagging and closing questions about EOL-ed as off-topic, why don't you just leave them! People who want to answer can answer. People who no longer run 10.04 cannot answer them.
Just make sure they are correctly flagged as "10.04" or whatever, so that people no longer running 10.04 can happily ignore them.
This is how a volunteer Q&A community should work, by not getting in the way of the organization of human knowledge with arbitrary rules.
This approach keeps everyone happy. In worst case the guy asking a 10.04 question gets no replies because no-one still runs the OS. In best, someone else running 10.04 gives just the answer he was looking for, and the net knowledge in the universe has increased.
The status quo is as it is because we abide by Canonical's support timetables for any given release. The Ubuntu IRC channels (and indirectly, the official flavors' channels) all follow that policy, and to some extent the other Ubuntu support mediums follow the policy of not providing support for any (new) EOL-release questions.
Basically, do we need to change, keep the status quo, or do we need to consider adopting Darren's suggestions?