I think you are being a bit harsh. What is great about BBC6 music is they do give new artists some exposure. That said unless they then get playlisted and repeated its a massive battle for them.
What you are so right about is the amount of really great music to choose from now.
Spotify are trying to perfect their play listing to allow users to find the music they like. They are not quite there yet but they are making progress. I would like to see some Spotify genre charts where major artists are automatically excluded. In other words the charts would only include lesser known artists. They could usefully do them country by country too.