Brad Klein,
I think you're right, that the triplex situation only exacerbated and existing problem.
As courses distanced themselves from their architectural beginings, as a succession of new superintendents took over, as clubs became more democratic and as legal issues reared their heads and all combined with human nature, minimum wage labor, and fuel costs, greens have shrunk.
But, at a course that I'm familiar with, redone in 1991, in less then 10 years the greens had shrunk considerably, especially in tight or configured areas, and that club uses nothing but walking mowers.
I submit that the superintendent must be aware of the issue, and each year instruct his crew, a crew that tends to have high turnover, to properly mow the greens. And then, he must be the quality control agent, assuring that they are being properly mowed.
It's a form of erosion, and without intervention, it will continue to occur.