No manufacturer, not even performance orientated Porsche, can ignore the "green wave" that has hit the automotive industry. With hybrids and EVs becoming increasingly popular, it's clear that sports cars have to step it up a notch.
It doesn't really matter to pencil-pushing government officials that, in the real world, high performance vehicles aren't driven as much, so, in the overall scheme of things, they actually pollute a lot less than your suburban folk's Prius. They just want to see numbers.