TURIN—The biggest reason you don’t see more Fiats on the road today is that drivers didn’t buy them. A problem that has eluded Fiat, and now Stellantis, for years. The 500, the 124, and... well, that’s about it. Still, Stellantis refuses to let the brand die. They let the 124 die, but they aren’t letting the 500 die. They’re just getting rid of the driv…