I don't agree with this personally. If you want other players to be able to use your vehicles then you can put a simple password on it, for example "1" which a lot of players already do. This feels like a solution to a problem that doesn't really exist, and some of us got vehicles that we don't want other players to be able to use and having to put a random password on those vehicles to prevent that feels a bit pointless.
Plus you can use /drive to let another player use your vehicle if it doesn't have a password.
Plus you can use /drive to let another player use your vehicle if it doesn't have a password.