Absolutely! I just listened to this episode on podcast, and that was exactly what I was thinking. First of all, I live in South Florida, and I can tell you from personal experience a black car IS hotter. Sure, once you are driving for a while, the a/c will cool just like any car, but imo, it takes longer to cool the cabin b/c it is hotter to begin with. That's not scientific, just my own experience.
But my other thought was about the maintenance. ESPECIALLY if you have owned a white car for 20 years, which shows relatively little dirt, you will be very (unhappily, I believe) surprised how a black finish shows every fingerprint, speck of dust, surface scratch, swirl mark, etc (swirls and scratches are especially bad if you do not wash your car by hand and use car washes). While you can stretch washing a white car for a couple weeks, a black car looks filthy again in only a couple of days. It is also difficult to keep shiny, and in South Florida sun & heat, the paint seems to oxidize faster on a dark than a light car.