Wow. Mind boggles at the possibilities...
E.g. I can see some heavy goth band with Cthulhu doing all the singing.
Very cool actually. I mean, a lot of it is about "cool visuals" that are entertaining... This "style" of performance is definitely here to stay, IMO.
(Darth you're just jealous because you're afraid that you'll wake up one morning only to find out that your stage presence is no longer needed as you've been replaced with a hologram of actual Darth Vader doing 5-element XY linking form upside down while singing the heavy-metal version of the Canadian national anthem. Can you beat that? Didn't think so!!)