Not to mention how much more functionality present day cars have. (mentioned in a couple comments elsewhere, but things like airbags/backup cameras/other sensors etc).
While flight travel has got cheaper by making seats more compact and planes more efficient, the cars go the opposite direction - drive luxuriously like kings and burn the planet with bigger and bigger gas guzzlers...
Unfortunately those are often not on the list of mandatory features.
Electronic stability control doesn't sound like it adds any meaningful costs over ABS. Backup cameras are a cost but not a huge one. What else is there?
Pretty much every AWD car can do "dumb" ABS that uses pedal pressure to run with just the sensors the AWD system uses (front axle speed and rear axle speed) but you need an expensive ABS system with a pump and a throttle by wire system if you want to be able to have the system do stuff when no foot is on the brake.
Is throttle control a mandatory part?
Throttle control is necessary because you need to lock the driver out of the throttle for ESC. Think of ESC as basically preventing soccer moms from mashing the pedal and getting sideways unnecessarily. Depending on how sideways they get initially the ESC programming is going to want to drag certain brakes to help get everything good again and that requires a pump since the driver's foot isn't there to give pressure (it might still be on the gas).