With continuing green legislation and regulatory enforcement, it will be more difficult to be in the "performance" setting and meet the legislation and regulatory efforts. There are standards for measuring power consumption both for some products used and some products sold. For example, for telecommunications systems, ETSI has defined standards for measuring power consumption for a number of product types, so that systems which power down under lower load intervals have better evaluations. The companies which install these products are under both regulatory and financial pressures to minimize electricity consumption. I'm sure other industries have similar pressures. One could see a future where Microsoft advertises lower power consumption per workload than Linux if we don't get this right.
I think the question is how do we get the right people motivated to make the performance of power saving scheduling algorithms have a minimal performance impact compared to existing algorithms, while still having relatively low power consumption. For those of us who pay others to supply their kernels, I suppose the only way we have of doing this is to tell our suppliers of the importance of the issue.