I can maybe see for a very limited time, but AP holders is a group I would be shocked if they were left out in the cold for too long. I expect this system is not a niche perk for big spenders, but intended as a popular perk for most users. The fastpass queues are too big a feature engineered into the park. The cost to modify all the queues would not be trivial. Honestly that maybe the biggest reason to get the FP system back online is to get people out of sun and public walk ways and back into their richly themed, often shaded, queue system.