The Hyperloop (or something similar) is, in my opinion, the right solution for the specific case of high traffic city pairs that are less than about 1500 km or 900 miles apart. Around that inflection point, I suspect that supersonic air travel ends up being faster and cheaper. With a high enough altitude and the right geometry, the sonic boom noise on the ground would be no louder than current airliners, so that isn’t a showstopper. Also, a quiet supersonic plane immediately solves every long distance city pair without the need for a vast new worldwide infrastructure.
Entry into the car was by the means of two gull-wing doors on the sides. The concept was a 3-door, 4-seat coupe design. It also had an upwards opening hatchback door giving access to the trunk and cargo area. All 3 doors were motorized for a sensor-based “keyless” entry. Pressing on a single button on the keychain automatically opened the nearest door , making it easy for somebody holding bags of groceries or other sundries to get the things in the car without putting anything down. The interior was maximized for easy storage and good looks.