The same goes for monomolecular whips. In fact, monomolecular lines are not like what most cyberpunk writers have envisioned. Hovercraft will never replace cars. They lack sideways control. However, for amphibious usage or sport usage, they have their uses.
Wheels are still better.
Jet cars are not good technology. Vertical Take Off and Landing aircraft are more efficient. Helicopters are more maneuverable and are also efficient. Tilting engine aircraft show much promise. Theoretically, they would beat out VTOL aircraft, but not helicopters.