It wouldn't really work, and i'll tell you why.
Look at the other threads, the achievements thread for one, is supposed to be for anything giffgaff related. But people make a separate thread that it's their 'giffgaff birthday of 1/2/3 years' etc, even though they post regularly in the allotted thread.
The 'have a wonderful day' thread. It doesn't stop people making separate threads saying, 'hi giffgaff friends, have a great day'?
And the people that do this do use those threads, so there's no excuse for it really.
But having a good night thread isn't really needed, because on a 'normal' day we don't actually get that many making them. The ones being resurrected lately are obviously from a member (past or present) who are just trying to make a statement about how bad GD is. And it worked, we're talking about it right now!
Plus, do we really need another long running thread just for people to be cliquey and kudos each other in? Personally, i don't think so.