In the United States backup cameras, tire pressure monitors, and electronic stability control are required by law.
So out of your list that leaves..
GPS (already optional on most cars)
Ass warmers (already optional on most cars)
Telemetry (this could be removed from models that have it, not all cars sold today have telemetry)
USB chargers (really don't think USB chargers are causing a production shortage at this moment)
Proximity Sensors (already optional on budget cars)
Keyless entry (could be removed, I doubt many people would buy a new car without keyless entry tho)
Remote climate control (already optional on budget cars)
So out of your list that leaves..
GPS (already optional on most cars) Ass warmers (already optional on most cars) Telemetry (this could be removed from models that have it, not all cars sold today have telemetry) USB chargers (really don't think USB chargers are causing a production shortage at this moment) Proximity Sensors (already optional on budget cars) Keyless entry (could be removed, I doubt many people would buy a new car without keyless entry tho) Remote climate control (already optional on budget cars)