Spot on.
The reason they're not revived at typical oldies nights Stu is that if a record is not in the established core of "200" records that get hammered ad nauseum then they just arent given a chance. As Dekka says there is a vocal element who wont allow it and if, god forbid a DJ empties the floor, then its the end of civilisation as we know it - bags slung over the shoulder and out they troop
Hence Dj's wont take a chance on these records for fear of emptying the floor and they play safe instead of taking a chance.
A lot of these records are played in small pockets, you have to know where to go but I can't see things ever changing for the majority