I seriously doubt they will reach high volumes just by dropping the price to $500.That's not what I'm saying. Sony's costs are going to drop substantially later this year when 65nm becomes standard and when BR costs lower. The marketplace is forcing them to $500 on the high SKU. If they drop the lower SKU then they won't lose as much money.
And why is the marketplace forcing down the price of the high end SKU?
I think the high end SKU can be slightly changed (like a slightly larger HD, that costs Sony maybe $5 extra) and the price can be kept as is.