IMO, I don't believe in any way that Battle.Net and the magic 8 accounts has anything at all to do with us. I think it has to do with Blizzard wanting to have a central location for all Blizzard games including Diablo and Starcraft. I think it's convenient for families, as Asterix pointed out. The idea of Blizz sitting around saying "Hey, lets invest all this time and manpower to make it easier for the handful of multiboxers to log in by combining WoW accounts under a BattleNet account" just doesn't work for me.

On the other hand, I'm sure there's tons of people out there with mom or dad + a couple kids playing WoW, maybe a Diablo account and a SC account and you're already up to 5+ accounts on one BattleNet, nevermind whatever else Blizz will have coming down the pipe over the next 5-10 years.

Blizz has said from day 1 that they do not support multiboxing, they allow it. There's a pretty big difference between those two terms. Supporting multiboxing means they actively develop the game with us in mind, which they have never, ever done. Allowing multiboxing only means they aren't going to ban us for running several accounts at once, assuming we do nothing else to break the rules.