Uni is still selling packages at off site hotels on their website. Until that changes, they would have to account for those people.
Say a family buys a package through universal Takes that hotels shuttle to the current resort. Goes to the park, but then decides they want to go to the new resort. They go to get on the monorail/bus/whatever, and are told they can't use it, they have to take their hotel shuttle. I don't think I'd want to be working the customer service booth that day...