Somewhere along the lines of both Noreen and kat is where I fall. Do the DT Studies and incorporate in them anything you wish included copied posts......But outside if interlinking the original threads as is often currently done now by you Joe and several others of us, I would prefer the threads be left intact.
I would be all for deleting threads that are without any value such as "Harry Legg-Please Call Me" where someone is trying to find Harry Legg. We have lots of the threads that have no purpose past that day and I think those might well be deleted.