My biggest issue is that preferred parking and the VIP lounge are already comically overcrowded thanks to the clearance sale on passes that ran for like 3 months, and now they've just given free access to a bunch of people who intentionally chose not to purchase the prestige pass. You already have the park defenders scolding people for having an issue with it, too, since they didn't upgrade everyone who bought during the clearance sale, just the people who bought it after that. Presumably, though, a good number of people purposely didn't buy a prestige pass since the big sale, since Six Flags felt the need to make a public announcement about it.
They did something similar at Wonderland when they discontinued the regular season pass (after selling tons of them) and replaced it with the silver pass, and upgraded everyone who had purchased a regular season pass to a gold pass, and the people who paid extra for gold passes were basically told "tough luck, your fault for buying a gold pass and not a red pass". And then they wonder why people are hesitant to give Six Flags their money.