Counterintuitively, now would be a great time to invest in real estate in Seattle. This law banishes everyone who isn’t worth 15/hr from the city limits. They will move out to the suburbs, and the lilly whites will move in, gentrifying the city into a white liberal enclave. Lilly whites don’t mind ridiculous costs of living, so there will be a real estate boom there.
There has been some renewal in those areas already over the last five to ten years, but what you say might accelerate it.
If the feral amish left those places I’m not sure where they’d go. Maybe to the deep South?