The vast majority of killers aren't aiming to kill a lot of people. Just one, usually. You're focusing on the dramatic mass killings instead of the significant majority of murderers, who could switch to knives and acid.

And then there are the mass killers, but since vehicles won't be banned because they have "overwhelmingly more legitimate use", they would remain available for mass killings. As would bombs, though that does require more skill than the other weapons.

And guns would remain available too. Gun control does very little to prevent criminals from obtaining guns, as the gun crime rate in Chicago shows.