Great piece by Car and Driver on the death of the naturally aspirated powerplant...
The Future for the Naturally Aspirated Engine Is Grim ?*Feature ?*Car and Driver | Car and Driver Blog
he short answer is that modern automotive progress is driven by fuel-efficiency concerns, which are on the agendas of every major government. Witness the ever-evolving European Union legislation on economy and emissions targets. Californiaís Air Resources Board (and the 16 other U.S. states who copy those regulations) has certainly had its say, as well as the U.S. governmentís CAFE mandates, and Chinaís State Environmental Protection Administration (which typically follows in the wake of the EU) and Japanís Ministry of the Environment are in the conversation, too. It was the EU, however, that led the procession around this particular corner in the wake of 1992ís Kyoto Protocol.