Will every thread with Mikael involved in it have a debate about metal now?
Probably for a while... People will get their panties untangled eventually. Or just take them off and go streaking, proclaiming their hatred for anything vocally quiet as they say so in a terrible imitation of Mikael's growl. Either that, or this collaboration will blow their puny little minds into a million pieces and then they'll realize that whatever these men do, they'll do it well. Perhaps both. Then they will bow at the alter that is Steven Akerfeldt. Only sound will tell.
Here's the thing. I like Heritage, yes I, a HUGE metal fan said that, its really good, but the thing is, I still like Opeth's metal side a tad more, and it'd feel like a waste for him to just throw that part of them away, as that side is monumental and beautiful as well. And in all actuality his growls aren't to hard to do, as he does them correctly instead of tearing at his vocal chords as others might, and if you learn how which takes practice but isn't insanely difficult you can growl as he can
I've been learning for a long while.