Hello, hello
Following on from this thread, we've been having a think about a new, more-serious-than-Chat topic in which threads would automatically go pffft after 30 days.
The simplest thing we feel would be a new topic called '30 days only' with with a note at the top explaining that it's (broadly speaking) a more serious option than chat for any threads which you'd rather didn't stick around for too long.
As you know, we don't really see ourselves as topic monitors, as going off-topic isn't against our Talk Guidelines. So it isn't our plan to 'police' threads in this area to ensure that they're sufficiently serious and/or on-topic, it's more of a "nudge" and no one will get into trouble for posting in the wrong place unless of course it's a deliberate attempt to derail (see my post here by way of further explanation.
We'll give this a go and see how we get on with it. As ever we are open to further thoughts/ refinements/ general tinkering about.
Many thanks.