I dont think this will make an impact on WDW. We were just there to both parks (Uni & Disney), and Uni doesnt even hold a flame to Disney. Even with the new extension at Uni all you will need is 1 day there. My husband and I both said ok, we saw Harry Potter, now we dont have to go back. We don't feel that way about Disney, we go every year!!
The thing is, that one person's personal experience is just that. While some people might think like you, others might see it quite differently. My first time at Uni was one day this October. And while we were lucky and did see a lot thank to very low crowds, I certainly want to go back for at least two days, maybe longer. And I am looking into staying in one of the Universal Resorts.
So, while both reactions might be possible, just the fact that there are people like me is bad for Disney from their business point of view. Until now I have been one of the people who flew to Orlando just to visit WDW. I am not anymore.