You can't tell me that two more HP's opening, one across the country and another over seas, will have zero effect the attendence at the Orlando park at all.
Anyone who was planning a trip might be inclined to stay closer to home, the biggest factor for going to Orlando now is that a Disney visit could be added on, and wait for those to be finished.
And with HP 2 being worked on I wouldn't plan on visiting Orlando until that was done anyway.