Subject: Re: A $10 Trillion Market?
People become very attached to things which they bond to their ego and are reluctant to lend them out

They will not be given a choice--by Tesla. It is very easy for them to do it. Tesla can refuse to update the vehicle's software unless the owner agrees to allow the vehicle to be used in the public fleet when needed. If the owner refuses, they are knowingly refusing future updates/upgrades to the vehicle-including any needed upgrades to hardware on the car paid by Tesla.