Even with a lot of labor going into the maintenance of the scrub areas, I think they still will come out ahead. They are saving a lot of water, fertilizer, labor, and diesel to mow all that rough that was there previously. Plus, way less irrigation heads to adjust/replace, zero supplemental irrigation, way less clippings management, etc. Furthermore, you can pretty much assign "native management" as a constant task day in and day out with minimal disruption to golfers. I think if they follow a sensible gradient of importance it won't be too bad. For example, 5 yards into the native you encounter mainly wiregrass, while deeper you encounter more and more species. Will it be easy? No. But nothing is easy in maintaining a course like No. 2 with the rounds they pound through there.