Right I'm going to say it (prompted by Geoff) and damn the consequences. I think there could be a few more oldies chucked into DJs playlists for the new punter or the returnee stomper. A hell of a lot of DJs don't play any in a spot and sometimes their playlists read better than they sound. This really isn't a dig at anyone in particular, I've got no one in mind and I'm sometimes guilty of it too.
The oldies themselves should be a mix of the rare, the forgotten, the evergreen and even the crass; once in a while. I used to have this argument with some of the Stafford die hards and I think it's still appropriate today. Obviously it depends on the crowd, and sometimes it would be a bad move, but at other times it probably wouldn't kill anyone to play The Snake and it might give a couple of people a great night.
I don't think an all oldies dance would work, whereas an all rare could as long as the crowd knew what it was going to be. An appropriate mix is the ideal.
I think there are very few oldies DJs about down south, let alone good ones.