Motorsport needs diversity - which is one if the things I love about the WEC. Audi, Toyota, Porsche and now Nissan will all have something different as a solution to the question. The WRC like F1, WTCC doesn't have this; all WRCars have a 1.6T engine with 4WD...... I know technology is expensive - but this is a World Championship - if the returns are better then it's possibly worth it. Which again returns us to the promotion problem.