There have been studies, some quoted in this thread, that indicate guests are using FP to spend less time in the parks. Disney had hoped guests would be using the time saved to shop. Alternatively MYW Dining seems to have done a good job persuading guests to patronize the restaurants.
Universal actually got rid of their version of express pass. Universal hotel guests continue to get preferential access but other guests have to pay if they want to access the express lines. Disney probably has too many hotel rooms to mimic Universal's policy but they could change the FP system to offer preferential treatment to resort guests or to guests who're willing to pay for some type of premium pass. One rumor even had some guests being able to obtain a special pass that would give you a FP with an immediate return time no matter what.
Universal actually got rid of their version of express pass. Universal hotel guests continue to get preferential access but other guests have to pay if they want to access the express lines. Disney probably has too many hotel rooms to mimic Universal's policy but they could change the FP system to offer preferential treatment to resort guests or to guests who're willing to pay for some type of premium pass. One rumor even had some guests being able to obtain a special pass that would give you a FP with an immediate return time no matter what.

adverse affect that had been noticed. That is that the parks appeared to be more crowded with the same amount of people than before FP. They realized that FP gave people the ability to be in TWO
places at one time. And that meant they were either in a second line, or just in the park heading to another line. Whereas without FP, you were just in the one
line.
because we still had FP's to use! OH MY, we CANT LEAVE AND NOT USE THEM! 