I pitched a Lego construction game in 1989, and guess what: Minecraft is basically a Lego construction game. But at the time I was told no, that wont work. I pitched a western game and the response was westerns dont sell. And then Red Dead Redemption came out. Stuff doesnt sell until someone makes one that sells, and no amount of data can reveal what new thing is going to sell. The metrics and data guys, and the publishing guys will never come up with the next big thing.
http://slashdot.org/topic/cloud/deus-ex-creator-starting-his-own-gaming-academy/