In the new EGM, there's a small chart about new games vs. sequels:
Number of original (new Intellectual properties) games that finished in the top 10 sales in '04: 0
Number of original properties that finished in the top 50: 1 (Fable)
Number of.... in the top 100: 4 (Fable, True Crime, Rise to Honor, Red Dead Revolver)
Ouch.