Road use will go up. Fuel/energy consumption will go up. Maintenance costs will increase. Vehicle lifetimes will decrease. Congestion will increase....

All because formerly parked vehicles are now roaming the streets, dead-heading to their next pickup point. If any, since when I'm at work the majority of other people are also at work.

At any rate, I, for one, will not be sending my personal vehicle out for strangers to use as an ashtray, eat their lunch in, or generally mess up.