Sony doesn't need to do anything. Just drop the hardware price by $50 this fall, $50 next fall, and $50 the fall after that if you feel like it.
This generation is a complete rout, they are just going to cruise to victory.
Nintendo can be counted on to shoot themselves in the foot several times, and Microsoft has never put in the work to build their brand in a real way in Europe or Japan (or maybe they have but the end result is the same -- they don't have a reliable audience anywhere outside of the US), which means Sony wins basically by default.