Muscle cars would have made a comeback, but soon after pollution regs for motor vehicles came OPEC oil price extortion and high inflation that made cars beyond the basic too expensive.
Fast cars have made a comeback. There are many quick cars that start at not much more than the $30k average car price, and most of them are faster than all but the rare vintage muscle car, not to mention much better mpg.
Yep the 550-600 HP ones are coming out of the wood work.