I love their metal side. But album to album contrast is important, and I think if they did make a softer, more melodic album (let's say DT13) then it would be much more refreshing, and then if they went back to metal after something like that, I think the contrast would make it much more interesting.
But they're just going to do whatever feels more natural and what they're most passionate about, so it doesn't matter what we say.