Hey, some of us already have a 4-cyl mid-engined Porsche!
Don't forget, the E30 M3, with it's highly-strung 4-cyl, is viewed by most as the most visceral version of the M3, and it's an excellent track car. A 4-cyl is a different experience than a more powerful 6- or 8-cyl, and it can be a lot of fun on the street. Nothing like having a car that weighs closer to 2,000 lbs as compared 3,000+ lbs when it comes to transitions and general maneuverability.
BTW, another 4-cyl advantage: I drove from Phoenix today to our house in Flagstaff and back. It's about 175 miles each way, with a 6,000 ft elevation gain going to Flagstaff. I drove my new Honda Fit Sport, cruise set between 75 and 80 mph on I-17. On the steepest grades it dropped all the way to 3rd (at 70 mph), just under 6,000 rpm, but Honda builds a pretty smooth motor, so it wasn't unpleasant. Round trip mileage (as measured by actual fuel consumption and mileage, not by the wacky "avg. mpg" guage) was 35.3 mpg. Not bad!