I think we can all agree that not enough of a capital investment was made for WWoHP. Maybe Universal feels they've invested enough, but I'm sure most theme park/Harry Potter fans won't/don't feel that way.
Universal is not fiscally healthy right now. Spielberg played a huge role in the creation of Islands of Adventure, and Universal will be paying for his services and licensing for quite some time (the actual theme park wasn't cheap to build either). The Spiderman attraction alone cost Universal Approximately 75 million dollars to create and build in the late 1990s. I can understand to some degree why Universal didn't invest more into WWoHP; although I wish, as a fan, they would have spent a billion dollars.
I really want WWoHP to be a huge success. If for anything else, I was hopeful it would push Disney to do more. Competition is to our advantage. If WWoHP is successful for a number of years Disney will feel compelled to up their game and make additional theme park investments. In the end, the guests and fans win.