I haven't needed that many bars in Beta, and I don't know if I'll need them at launch, but I can't see why this would be a problem. There's no decent place to PUT a vertical bar really... I hate things being in the middle of the screen and mucking up the scenery. I need everything to be as out of the way as possible, and with the mini map and the duty list and the party list and chat log... (and my map almost always open)...there's no real room for a vertical bar.
