I think Amaranthe needs to promote Elize Ryd more, and less of the harsh vocal dudes. Nobody cares about the dudes. Elize has the vocal chops to carry the band, and she certainly has the looks.
At the very least, they could mix up the order of the vocals. I mean, now it's harsh male/clean male/clean female. It's a formula that has worked well for them, but variety is the spice of life, as they say.