I think that for Disney and Universal to take shots at each other is silly. Everything down there from the big kids on the block that is Disney World to the little museums on International Drive contributes to making Orlando an attractive destination instead of a city that tourists are just passing through on their way elsewhere.
I am more of a Disney lady because a lot of Universal Studios attractions are too intense for me. For example, I am quite certain that I could not handle Halloween Horror at Universal Studios so it is better that I mozy on over to Mickey's Not So Scary Halloween than to go into Universal and freak out and possibly hurt myself or someone else during the course of said freak-out. Yet I went all the way to Universal Studios-Hollywood from San Francisco to see ET while it was there, and I would not have gone back to southern California at all at that time if ET had not been at Universal Studios.
The kind of people who let their little ones stay up until past midnight to go to Potter Parties in book stores will be flying trans-Atlantic or trans-Pacific to see Harry Potter. Disney has no reason to have a beef with Universal for that because they stand to benefit from people who would not have gone to Orlando at this time if it were not for Harry Potter at Universal.