Even Though The "Energy Star" Program
Is purely voluntary, the federal government, tree huggers and others have done such a good PR job that consumers look for that sticker.
With even more strict energy use regulations coming for washing machines, most of today's top loading washing machine designs are going to fade away.
There simply is no getting around that top loading washing machines need water, lots of it to do the job. Otherwise one has laundry being beaten to death against the agitator and grinded against each other.
Considering R&D costs, and the fact the market for "major appliances", has changed so much one doubts Whirlpool or anyone else is going to commit vast sums to developing traditional top loaders to meet ES standards. Not when they can make more building so so quality front loaders though loaded with bells and whistles, won't last nearly ten years, and sell them for a good profit.