The goal is to create a genre title that applies retroactively and inherits the qualities of metal that we want to see in future acts, then? Sorry if this is obvious - I just wanted to ask and give a statement to be clear.
I like Bagel's suggestion alot - in the most general sense, metal should be referred to as cultural music. Instead of a genre heading we get a valuable way of talking about the relevant music and it should indeed start interesting discussions as he pointed out. It doesn't need to be opposed to compositional music. It can often involve complex composition, but it doesn't have to. The important distinction to be made is to oppose it to the general mass of cultureless pop music. It is then our job to discuss this culture.
As summoned said, genre titles apply retroactively, so my anxiety was then: what good does it do to create one now when we don't even know what lies on the horizon yet? Well if we want a general heading, referring to it as cultural music will work. Whatever direction the next great surge is in, we will find it by seeing it as a movement in Hessian cultural music and shared world view. hi.arc.tow is valuable to this end, for it can consolidate potential candidates.
Do we really need a genre heading, though? Death and black metal have important historical ties. There is a certain tradition that is followed, a way of playing that is passed down, inspires, and then is worked on further. This musical side is important to the genre distinction. What seems to get lost is the culture and world view side of the genres. Are we not simply interested in music that has not lost its culture, regardless of what kind of metal it fits into? I think the fact that there are these two sides to a genre distinction makes creating one retroactively that will also apply to all great things on the horizon incredibly difficult. New stuff will probably take from death and black, but also from who knows what else. We are simply interested in hessian metal, in metal that does not stray from its own culture.
There have been some good suggestions, so I don't see why this discussion reeks of fail... unless the it was wrong-headed from the start, in which case it would be helpful to flesh out the reasons why this is not worth talking about. I think it's pretty damn interesting to think about.