Emo/pop punk bands like Jawbreaker, Shoegaze like My Bloody Valentine = variants of indie rock. Musically, WITTR is this, with a little black-metal flavoring.
What I find interesting about WITTR and Modern Drone Metal in general is that along with Sunn O))), the genre itself seems to be adopting what you call "Black Metal Flavoring" as a standard.
I see the Southern Lord troupe attempting to do what hasn't been done yet: elate Drone Metal to be the successor of Black Metal. This is a noble endeavor but I'm still questioning the value of such a genre. Here's the high points:
1) The Oversimplification of the principals of both the Black and Doom Metal genres may help people to unlearn the modernity that they've come to accept in popular metal (Lamb of God, Trivium). At the same time, Drone Metal also exaggerates some principals, like longwinded riffing, repetative nature, obnoxious soundscapes etc...
2) Using production as a new medium of expression. WITTR records analogue (reel-to-reel apparently).
3) Return the audience to a state of sanity. There was a time where people where way to concerned with being "true" or "kvlt" and I think with the rise of Drone Metal and their sneering attitude towards elitism, the face of Metal and the attitudes presented has changed drastically. I remember a time when a friend of mine in a very popular, internationally selling Black Metal band got married in a church to abide the wishes of his wife's parents, and when he showed me the pictures he said, "You can't tell anyone that I got married in a church... it would ruin _________" - True Story
The following bands "musically" have struck my fancy and have "Droning" principals... and it's going to take a while to decide whether I really like this form of music or not.
The Funeral Orchestra