Everyone wants new attractions, but a simple fact of life and mathematics is that a popular new attraction for which the number of people who want to ride in a day significantly exceeds the ride's capacity is going to create huge demand and lines. It happened with Test Track, Indiana Jones and Radiator Springs Racers at
Disneyland, the Harry Potter attractions., and 7DMT. And it's going to happen with the Frozen rides, the new Pandora rides at DAK, and the new Star Wars attractions.
Personally, I think this is one of the underlying reasons behind FP+. With either standby only or the old paper FP system, getting on the newest and most popular attractions without a massive wait required getting to the park early. FP+ mitigates that crush because a lot of people will have their reservations set ahead of time and do not have to rush right to the hot new attraction. Many of them won't bother to be at the park at opening at all.
And you can't be surprised that an operator of a theme park resort that includes hotels is going to provide an advantage to its onsite guests.
I would challenge anyone to come up with a system that would satisfy everyone when you have a park with 30 to 50,000 guests a day or more, a high percentage of whom want to experience an attraction with a daily capacity of 10 to 20,000 riders per day.