I agree and disagree. Turbos and high revvers are fast, no doubt about it. But then again, look at Polygon's examples about torque. Either way you look at it, boring+stroking and turbos both increse power....if you, say, increase an S2000's engine sixe to a 4.0 liter, it will be far more powerful, but if you turbo it you'll get basically the same acceleration as the 4 liter car, it's just in a different way. Yes, there are replacements for displacement, but a 4.0 liter turbo engine will whoop a 2.0 liter turbo engine anyday....
Rotary's are a different story altogether, as they don't really even operate on the same principles...small rotarys produce so much power because they have 3 "bang" "strokes" per revolution, where a 4-stroke piston engine only has .5 per revolution....