I disagree. You can't pay for the press that showing a line going out of the park and wrapping around Citiwalk brings. they would gladly deal with the headaches of being well over capacity for a couple days to have news stations around the world showing the crazy crowds and lines for Universal's new attraction.
That's totally true...the press was great for the most part! However, I have a feeling there was a lot of people complaining and demanding a refund because of how long the wait was. With any good press also comes the bad press. I am sure a ton of those people that where there opening day where complaining to friends and posting on facebook/twitter while waiting in the line just to enter the park. What about all the people that didn't want to see Harry Potter (or know it was opening) and just happened to schedule their vacation during that time and were turned away because the park was full. If a family could only take one vacation every four or five years and they booked it a year in advance only to have it happen during HP opening and they had to wait for hours just to get into the park, Universal would be off the list of places to visit because of how poorly things were managed. You can guarantee they also told everybody they know about how bad the experience was.
Each option has its pro's and con's. You either cause a nightmare for everybody involved (guests and all TM's throughout the park including front gate, guest services, Diagon TM's, security, etc) but get some good press and a bunch of bad press from all the upset guests or you open it randomly and while you have basically every theme park and major news outlet at the park getting interviews from guests to create the press and announce that it is open without causing bad press because the parks are not seeing the HUGE crowds and causing people to wait for hours just to enter the park. Universal knows that people WILL come to visit no matter how they open it. The first phase proved this. The question is, are they going to go the same route and cause another nightmare for a week and get both good and bad press, or surprise the world and just throw open the doors causing a storm of good press without nearly as much bad.