There are many more Frost than Arcane Mages in the SK-100. The specs are at least equal in strength, if not slightly favoring Frost. Ergo, you can be equally successful with either one. It's just a question of whether you want training wheels or not.
I'd recommend not using them, because there's a pretty good chance that the nerfbat is going to swing the pendulum even further towards Frost. And you can have a little self-respect.
SK-100 representation is in no way convincing evidence. How many of those frost mages never even tried Arcane, or decided to not stick with it because of ridiculous peer pressure like you're trying to apply instead of judging which is the better spec?
Furthermore, let's say hypothetically I'm a knuckle dragging retard. I'm a 1400 mage. I spec arcane and now I'm 1700. That's pretty much the definition of a better spec in my book. Are you going to say that doesn't happen?
Ultimately you're convinced that frost is >= arcane, I'm convinced that the opposite is true. That's the heart of the disagreement I think.
I have more than a little self respect when it comes to my spec decisions. I'm very confident that I choose my spec in a much more logical method than you're capable of.