Pull-Grader Land Levelers can have GPS Attached, so contractors can get away with using lower-skilled/lower-paid for smoothing out haul roads and blading the final grade with a less expensive ag tractor for earthworks projects.
I think Motor Graders will always have their place, however, as you have identified, they will become increasingly more scarce, and more regionally focused to climates with snow and township/municipalities with many miles of gravel roads.
I think Motor Graders will always have their place, however, as you have identified, they will become increasingly more scarce, and more regionally focused to climates with snow and township/municipalities with many miles of gravel roads.