They've sold a lot of the properties off in New York already, they will have a set deadline for having to move Bethelites out of there.
If they have been relying on volunteers to build Warwick there might be things that have been going wrong, I don't think they've tackled such a large project with so many volunteers. Some posters on places like reddit have stated that work has to be redone because it is not up to standard and who knows what sort of other problems they have been running into.
But the deadline is there. It may be that they have to start looking at engaging worldly contractors to help with the Warwick build and because it hasn't been costed in, it will be a huge cost.