The Rooney Rule wont achieve anything though IMO, the problem occurs before the point of managers applying for jobs. The line 'there are no decent black managers' in my eyes is a valid one, so the question you need to then ask is why arnt there?
Just incase anyone has forgotten, here are some choice quotes from wikipedia (his page for some reason doesn't include the normal win% stats, I wonder why....)
At Blackburn: "After winning just three games in 17, Ince was sacked on 16 December 2008 after just six months in charge."
Then at...