I really hate to be a downer but in the event of a (hopefully mild) slowdown, should they have to make the choice between:
A) Halting Monsters and Dragon construction and focusing on getting SNW and Ministry ready on time
B) Delaying the whole thing to ensure a "complete" park on opening day
...I think that they should choose A. Yes, there would be complaints about it being a "half-day" park but I would much rather have that then having to wait ANOTHER year or two.