The point continues to be missed.
Forget comparing total numbers between Disney and Universal. It's apples and oranges, like comparing GM to Porsche.
As said before, it's the lost revenue that is causing Disney a headache. Lost from merchandise, food and beverage, and tickets. Where guests used to buy, say, a five day hopper, now they may get a three day in order to spend those other two days at Uni.
It may not sound like much, but trust me, it adds up to a huge headache for the suits.
This whole thing is happening because Uni built a great land with a cutting-edge ride, all based on the most popular franchise of this century. Disney had a chance to do it, and reap all the benefits, but they passed. Regret it? You bet they do. As I said before, its the whole reason they got into the Avatar business.
Also, it isn't just Potter they are fighting. As said earlier, they are losing the PR battle, as well. Disney is, like it or not, stuck with an image problem. They aren't the "cool" destination at this point. They are gonna have to confront their "kiddie" image at some point.