Great news. It's nice to see a ban in DLC 2 besides Arch. Volc in particular was way too much cheese and matchup flipping. Not dealing with it will make things much easier on the builder. It was very necessary to see it go.
As someone who has also been anti-Tera, I don't really think this is the time to harp on it. I also believe the Volc ban would be more likely to result in action on Tera than if it hadn't happened. Off the top of my head, you can now point to at least Regieleki, Espathra, and Volcarona that were banned in part because of Tera Blast specifically. Ogerpon has one form banned and another heavily on the radar, both of which probably wouldn't be needed without Tera. There has been a lot of stuff that was broken regardless, but now pretty much everything that is left is a borderline threat. A potential case is forming that an increasing percentage of these bans are/will be because Tera pushed them over the top.