Also, something to bear in mind is that the Universal Express experience is not identical to FP+. Go to Universal on a very busy day and even with Express you can easily wait 40 minutes for Despicable Me and Gringotts. When I questioned our wait once at Despicable Me I was told that Express only guarantees a 50% saving compared to the standby line. This would of course be a massive downgrade to the current FP experience at rides like FoP and SDD.
And this is my point, this is what will happen at WDW if they bring this in. In the end it wont really improve anyone's day over what's currently there, it will just make things more expensive for some, and even longer waits for others.