Alright people are getting tired of hearing me bitch on IRC so it's time for an actual post.
Fuck Excadrill.
Finally, intelligent discussion regarding Excadrill. The Adamant LO set is what got Excadrill its hype to begin with, then people for some reason decided to start running Jolly Balloon.
I do disagree on a few things however, and it is that scarfers have always been general set-up fodder and you have needed to run checks to the things that set up on them regardless. They are, however, still viable. I run Scarf-RotomW and it works just fine, for obvious reasons. If you decide to run a different Scarfer, pack an Excadrill check and call it a day.
As far as priority is concerned, why are we assuming that it has to do 100% damage? If Adamant LO is what we're working with, it will lose about a fourth of its health from switching into spikes and launching an attack alone. And Excadrill only has 1 immunity to switch in on. All of the pokemon running an electric-type move in OU have a means to hit Excadrill hard, and will be wary of it thanks to TP. Rotom-W, Thundurus, Starmie, and Magnezone tend to have water/fighting/fire moves, respectively. Revenging Excadrill (or not letting it set up at all) really isn't as extreme as your post makes it out to be. It isn't easy, but then that shouldn't be the case to begin with if you are relying on a pokemon as your main sweeper.
Weather wars are weather wars, I want Drizzle gone regardless.
RS Excadrill does not terrorize stall in the way you imply. As Mien pointed out, it will prolong the battle by quite a bit, but with Skarm + Hippo, Excadrill won't be sweeping anytime soon. Even worse if you aren't running balloon, because spinning those Spikes will take its toll (particularly switching into a Brave Bird here, being Roared out there).
All of that aside, I am
far more inclined to support an Excadrill ban if (and when) more people catch on and go back to using Adamant LO. Excadrill is currently manageable, but a 42% increase in power simply by changing the item and nature would make it a much more difficult contender to deal with.
Maybe y'all should acknowledge Sarkhan a little more. His sets are innovative and "tailored to the current meta"
No, that set seems pretty useless, IMO. Terrakion can run that same set to much greater effect for example (same item and everything), and Cobalion has little, if any, niche in OU. Air Balloon is a shaky check to Excadrill at best, because you have to either avoid switching in your Balloon user at all, or perfectly predict a ground/support move every time you want to bring it in.