Eisner closed 20K 9 years before he left.
The water park closed under Eisner
The 20K closure bit bad but we'll never know if the EuroDisney false start mothballed that ride.
River Country was never replaced but I genuinely do not know if it should have stayed open past the opening of Blizzard Beach, and 9/11 really torched anything not completely necessary to operations.
The SGE site sits empty because they can get away with it. Imagination languishes because they can get away with it. The Tomorrowland Amphitheater site sits empty because they can get away with it. The WoL pavilion is going on 2 decades of incomplete operation because they can get away with it. There is no nighttime parade at the castle park, the most attended park in the world, because they can get away with it. The monorails are allowed to rot on public display because they can get away with it. The RoL pavilion has no known replacement because they can get away with it. They shut down attractions during festivals at EPCOT because they can get away with it. The 2008 crash was the only externality on the parks division Iger had to grapple with. To my knowledge, there is no attraction decision you can earnestly point to under the Iger regime that suffered from that externality because nothing was gonna get built anyway.