Peter has it about right....technology will be the biggest driver of new style of design. It always has been from the bulldozer to the irrigation system. Irrigation tech and grasses are aimed at keeping our golf courses looking pretty much as they do now. But designs will change to use less water, probalby in the realm of fewer steep slopes, which will also be handy for ADA access and to make them more walkable for the aging population (and I mean from carts to ball and on to greens, carts will be more in use than ever)
As to low density land useage, I did have one client who wanted the driving range to double as the soccer field. I pointed out that the peak use times were probably the same for both, but maybe the lighted concept could have weeknights as soccer games and leave daylight for golf? I could envison golf courses doubling as cemetaries, and golf course lakes doubling as fish hatcheries, etc. to get more use out of the land.
With courses experiencing low play in the heat of the day, that night lighting thing might work in southern climates for golf someday, too, but not if they keep electric rates high and keep blocking the building of new power plants.