To comment on Disney doing eminent domain to acquire property. They can't do it. The City of Anaheim might be able too but I'm sure they would be tied up in court. Either way it would be a PR nightmare for Disney. There only shot is to buy it when it comes on the market or make an offer. As soon as people figure out what is going on the prices will escalate quickly on property that is needed.
Eminent Domain
The power to take private property for public use by a state, municipality, or private person or corporation authorized to exercise functions of public character, following the payment of just compensation to the owner of that property.