I've had mixed experiences at Dorney. They have some good rides - Talon & Steel Force are both great fun. I didn't dislike Hydra as much as people told me I would, either.
Locally, it seems there isn't a ton of interest in the amusement park (not like they aren't spoilt for choice, relatively locally). - they're all about the water park. You can visit the 'dry side' of the park and there be almost no waits for the majority of the day, but the second the water park closes it becomes an absolute zoo.
There were lots of rumours about them getting a GCI as they were rolled out across the chain, but that never happened - I guess it's a double win here, add something new to Dorney and banish more Intamin headaches from the maintenance budget.
The drop on their Log Flume is nuts
Where possible, I suspect parks will try and progress 2021 attractions. Most will already be in contract and they will be key in regaining lost momentum.