iTunes Charts

How do you find new music? I listen to the radio, see a music video, hear a ringtone, find it on a blog or a friend recommends a tune. However another popular way of finding new music is just shifting through the most downloaded songs on iTunes. Recently iTunes repositioned the most popular tunes into their own music chart.

With now more than half the music being purchased digitally, will iTunes eventually just become the Billboard Music charts?
http://www.apple.com/itunes/charts/songs/