Remember the Spiderman ride.
It was supposed to be the "latest, best use of theme park technology ever." And it was for the first two years, until Universal stopped giving it TLC. Like cleaning the projections or fixing little things that break or go bad.
Now if you go to the Spiderman Ride it looks tired and worn down. I noticed the last time I rode it that they didn't finish the experience behind you. So if you were to look away from the action on the drop you would notice it was all a bunch of fans and a 3d movie.
This is Universal's MO. They can and will build amazing rides, but can they keep the magic alive? HP will draw huge crowds this summer, but what about the value season when crowds are light? What about maintenance?
Plus, think about a typical family of two parents a 12 year old and a 6 year old. There are like three things the 6 year old can do at both Universal and IoA. Because the rides and shows are way to much for little kids. And Harry Potter seems like it is going to be one of the rides that little kids will not be able to go on. Remember the news reports when the books would go on sale of that cute little 8 year old dressed like Harry Potter in line to pick up his copy of one of the books. That same cute little 8 year old might get really scared at a ride that "twists you, pulls, you and throws you." I know my 9 year old will not go on it.
How is Disney combating HP? Very little, first because they do not react, they Lead. Universal is not a threat. Next, because they know that a family flying down from Minnesota for a week vacation can only spend two days max at the Universal Resort. So all Disney has to do is make their vacation deals sweet, with free days, Magical Express, etc.
Think about Magical Express, you do not have to rent a car. So when Universal is 20 minutes away, an you do not have a car, and a $40 cab ride one way away from Pop Century, are you going to pay all of that money just to see Harry Potter?
Oh and an interactive cue, seen it done it. Kuka robotic arms, seen it done it, 3d projections you ride through, seen it done it.
And think about this, you know that Marvel is probably getting part of the ticket prices as payment for Universal using their characters. Great, that money is now Disney Money. Keep it up.