I don't really like reading articles in the guardian, let alone linking to them, but I think this raises some very good points, that seem to ride against the consensus on this here website; specifically about niche programming. Does 6music convert people to new and interesting music? Or does it just appeal to people who would listen to it anyway? Idk.
http://www.guardian.co.uk/music/musicblog/2010/mar/22/6-music-john-peel-radio-1

(I personally STILL listen to Radio 1 a lot more than 6music, by the way)