A ban wouldn't be needed if DJ's used their imagination. It's like Pete said, there's no point him going out as he has a good idea of what he's going to hear as it's the same DJ's playing the same records week in week out
A little imagination, drop a few records, try the odd different one now and again and things would improve no end.
The era I grew up in most of the DJ's had their own identity and individual sets, they all comnpeted to play something different, that all changed with the returnees in the early 90's and not much has changed since IMHO.
There's 100's of records ignored so a DJ can play the Ringleaders he paid £400 for or Ruby Andrews he paid £150 and many more besides
Nowadays should be seeing the best of Northern Soul, the best records from the best part of 40 years yet it's far from it with little in the way of progression, forward thinking and least of all little imagination.