That's actually a great idea. Ferrari is already one of the world's most valuable automakers, with a market cap exceeding giants like VW Group or the new combined Stellantis from which they (sort of) came.

Any really large business that does something incredibly successfully eventually needs to seek other revenue streams to continue growing the business. In other industries for example we've seen Apple get into streaming and more services, or Netflix looking at legacy movie studios, gaming, and Netflix House. Ferrari already has begun this too, with their theme parks and high fashion line to create the kind of luxury lifestyle brand that we already associate with, say, Louis Vuitton (originally a trunk maker, now making of fashion, watches, restaurants, etc) or Armani (originated in fashion but now has products for your home, hotels, and floral, etc). I'd be shocked if they aren't internally discussing more ways of extending the Ferrari brand.

As it relates back to Ferrari with cars and your idea though, there's plenty more money to be made if they'd go with mass or premium brands so long as they effectively distance the brand from Ferrari proper will maybe letting you know it's still "from the same people who make Ferraris". Frankly, they might as well buy Alfa Romeo or Maserati, heck, maybe even Fiat (not like there's any great confidence Stellantis will accomplish much with any of these in the foreseeable future), and get into more segments to generate more profit. Or they can build a brand organically, call it Dino (why not), and position them against brands in the premium segment.