I think you have a fair and interesting point with other teams not being able to burst DK+Pally teams down so fast. All the arena games I play in are over VERY VERY fast. (The meaningful part, anyhow).

I just worry if that battles are drawn out longer, the advantage goes to the singleboxed teams who have finer control over their characters' actions. The "everyone focus fires at the same time" advantage that multiboxers have may go away significantly if burst is not as compelling a factor in winning matches.

One thing we CAN do that singleboxed teams struggle with is switch focus targets quickly and completely. That's a nice advantage now, but again, I fear that it becomes less of an issue later on. (Maybe a good way to cause healers to blow their mana pools less efficiently, though...)