I'm really happy for the guys!
But I'm not sure if they stand a chance against the other bands.
Mastadon and Foo Fighters seems like bands that are more "hip". Those bands get played everday on a Norwegian radio channel called NRK P3, as the only rock/metal bands. In the same radio show they play everything from the mainstream world like Lady Gaga and Rihanna, and hipster music like Florence+ the machines, the kooks etc. I've never in my life heard DT on the radio. Also, both bands have been playing those songs on letterman.
But watching the views on youtube, the official releases of OTBOA got 2,2million and 600k views, while the most viewed video of curl of the burl is 360k. White Limo by Foo Fighters has two official videos with 2,8million and 700k views. Most viewed video by Sum 41's song is 290k and Megadeth's Public Enemy no.1 got 300k, they've also been nominated 9 times without winning!
Sorry for the messy post, just sharing some information about the popularity of the songs, which really doesn't matter!
Well, I hope DT gets this award, how cool wouldn't it be to see John Petrucci getting on that stage on live television?