It is a good idea indeed but I must agree with chewett.It would require painstakingly huge amounts of time to create and get running.
What you really need to think about are'
1)How will it be set up?- From the MD toolbar or via a seperate website?
2)Permanant "Djs" you can't just have random people selected each day, even if that DID work then the flow would soon dry up.
3)The main person you should talk to is Mur.He is the owner of all copyright and trademark rights so it would be up to him if you could create it or not.
4)Like Chewett said the topics would start to repeat, which in