i think as long as there are racers/hot rodders on a budget, natural aspiration will be alive and well. big motors are so easy, we're going faster now than the p/a cars were going just a few years ago. it's all relative. my 10 second street car is reliable, and faster than many all out racers from "just" a couple of decades ago. 12 seconds was nigh untouchable for a street car.