That sounds very interesting indeed. And, according to that site, Blizzard can ban you for using a 3rd party program (mostly botting programs, cheats, etc., which I'm fine with). Does this mean that can detect if you are running ANY 3rd party program and ban you for that? For example, if they strike a deal with Microsoft, and then say "if you use Firefox, we'll ban you". Not very nice in the slightest, and I don't think they would ever be that silly, but could they?
Obviously, I would expect lots of people to leave WoW if they did, but "could" they? If so, I wouldn't agree to the EULA and ToS just for that really...
And FYI, I haven't read the EULA or ToS to any great length as I only tried WoW for 6 days. I'm just being curious.