I don't think you grasp how much a million is. In my playthrough of Coin Rush I got about 1800 coins in those three levels. I would have to play through that over 500 times to get to a million. I wouldn't consider that extremely easy, especially given the apparent difficulty of the game.
The game better be difficult. The trailers show Mario still getting 1Ups every 100 coins. That's 10,000 lives earned once you reach the million coin goal. Plus they've shown in other trailers that the Challenge Eliminator leaf has made a comeback.
And going back to the beginning of the talkback thread, I'm hating the music, too. I was already getting tired of the theme from its inclusion in both NSMB and NSMBWii, and now they've made it worse by flooding it with that stupid fakey voice. Maybe that's the million coin reward, make the music not suck.